Isotopes & relative atomic mass

This question is about elements in the periodic table.

Describe where the non-metallic elements are found in the periodic table.

Gallium (Ga) is a metallic element in Group 3.

Which of these properties of gallium is not typical of most metals?

Tick () one box.

A sodium atom can be represented as²³₁₁Na

Complete Figure 12 to show the electronic structure of a sodium atom.

Mendeleev created an early periodic table.

Mendeleev placed most of the elements in order of atomic weight.

Tellurium and iodine were not placed in order of atomic weight.

Why did Mendeleev not place tellurium and iodine in order of atomic weight?

Argon is an element in Group 0 of the periodic table.

Explain why argon is unreactive.

An element X consists of two isotopes.

What is meant by ‘isotopes’?

Answer in terms of subatomic particles.

Table 5 shows the mass numbers and percentage abundances of the isotopes of X.

Which is the closest estimate to the relative atomic mass of X ?

Tick () one box.

This question is about elements in the periodic table.

Describe where the non-metallic elements are found in the periodic table.

Gallium (Ga) is a metallic element in Group 3.

Which of these properties of gallium is not typical of most metals?

Tick () one box.

A sodium atom can be represented as²³₁₁Na

Complete Figure 1 to show the electronic structure of a sodium atom.

Mendeleev created an early periodic table.

Mendeleev placed most of the elements in order of atomic weight.

Tellurium and iodine were not placed in order of atomic weight.

Why did Mendeleev not place tellurium and iodine in order of atomic weight?

Argon is an element in Group 0 of the periodic table.

Explain why argon is unreactive.

An element X consists of two isotopes.

What is meant by ‘isotopes’?

Answer in terms of subatomic particles.

Table 1 shows the mass numbers and percentage abundances of the isotopes of X.

Which is the closest estimate to the relative atomic mass of X ?

Tick () one box.

Discoveries in chemistry led to a better understanding of atomic structure.

Atoms were originally thought to be tiny spheres that could not be divided. The plum pudding model of the atom was then developed. Figure 10 represents the plum pudding model of the atom.

Describe the plum pudding model of the atom.

Atoms contain electrons, neutrons and protons. Write these three particles in order of their discovery.

Very few atoms of the element tennessine (Ts) have ever been identified. The atomic number of tennessine is 117

Predict the number of outer shell electrons in an atom of tennessine. Give one reason for your answer. Use the periodic table. Number of outer shell electrons

Tennessine was first identified by a small group of scientists in 2010. Suggest one reason why tennessine was not accepted as a new element by other scientists until 2015.

The discovery of isotopes explained why some relative atomic masses are not whole numbers. Element R has two isotopes. Table 5 shows the mass numbers and percentage abundances of the isotopes of element R.

Calculate the relative atomic mass (A_r) of element R. Give your answer to 1 decimal place.

Discoveries in chemistry led to a better understanding of atomic structure.

Atoms were originally thought to be tiny spheres that could not be divided. The plum pudding model of the atom was then developed. Figure 1 represents the plum pudding model of the atom.

Describe the plum pudding model of the atom.

Atoms contain electrons, neutrons and protons. Write these three particles in order of their discovery.

Very few atoms of the element tennessine (Ts) have ever been identified. The atomic number of tennessine is 117

Predict the number of outer shell electrons in an atom of tennessine. Give one reason for your answer. Use the periodic table. Number of outer shell electrons

Tennessine was first identified by a small group of scientists in 2010. Suggest one reason why tennessine was not accepted as a new element by other scientists until 2015.

The discovery of isotopes explained why some relative atomic masses are not whole numbers. Element R has two isotopes. Table 1 shows the mass numbers and percentage abundances of the isotopes of element R.

Calculate the relative atomic mass (A_r) of element R. Give your answer to 1 decimal place.

This question is about atoms.

Figure 1 represents an atom of an element.

Draw one line from each name to the correct label.

An atom of element Y has:

• an atomic number of 9

• a mass number of 19.

Give the number of electrons and the number of neutrons in this atom.

Choose answers from the box.

Table 1 shows information about two isotopes of element Z.

Suggest the identity of element Z.

Use the periodic table.

Complete the sentence.

Choose the answer from the box.

Isotopes of the same element have different mass numbers because the isotopes

This question is about atomic structure and the periodic table.

Gallium (Ga) is an element that has two isotopes.

Give the meaning of ‘isotopes’.

You should answer in terms of subatomic particles.

Table 8 shows the mass numbers and percentage abundances of the isotopes of gallium.

Calculate the relative atomic mass (A_r) of gallium.

Give your answer to 1 decimal place.

Gallium (Ga) is in Group 3 of the modern periodic table.

Give the numbers of electrons and neutrons in an atom of the isotope⁶⁹₃₁Ga

What is the most likely formula of a gallium ion?

Tick (✓) one box.

Gallium was discovered six years after Mendeleev published his periodic table.

Give two reasons why the discovery of gallium helped Mendeleev’s periodic table to become accepted.

This question is about atomic structure and the periodic table. Gallium (Ga) is an element that has two isotopes.

Give the meaning of ‘isotopes’. You should answer in terms of subatomic particles.

Table 1 shows the mass numbers and percentage abundances of the isotopes of gallium.

Calculate the relative atomic mass (A_r) of gallium. Give your answer to 1 decimal place.

Gallium (Ga) is in Group 3 of the modern periodic table.

Give the numbers of electrons and neutrons in an atom of the isotope⁶⁹₃₁Ga

What is the most likely formula of a gallium ion? Tick (✓) one box.

Gallium was discovered six years after Mendeleev published his periodic table. Give two reasons why the discovery of gallium helped Mendeleev’s periodic table to become accepted.

This question is about metals and the reactivity series.

Which two statements are properties of most transition metals? Tick (✓) two boxes.

A student added copper metal to colourless silver nitrate solution. The student observed:

• pale grey crystals forming

• the solution turning blue.

Explain how these observations show that silver is less reactive than copper.

A student is given three metals, X, Y and Z to identify. The metals are magnesium, iron and copper. Plan an investigation to identify the three metals by comparing their reactions with dilute hydrochloric acid. Your plan should give valid results.

Metal M has two isotopes. Table 6 shows the mass numbers and percentage abundances of the isotopes.

Calculate the relative atomic mass (A_r) of metal M. Give your answer to 1 decimal place.

This question is about metals and the reactivity series.

Which two statements are properties of most transition metals? Tick (✓) two boxes.

A student added copper metal to colourless silver nitrate solution. The student observed:

• pale grey crystals forming

• the solution turning blue.

Explain how these observations show that silver is less reactive than copper.

A student is given three metals, X, Y and Z to identify. The metals are magnesium, iron and copper. Plan an investigation to identify the three metals by comparing their reactions with dilute hydrochloric acid. Your plan should give valid results.

Metal M has two isotopes. Table 2 shows the mass numbers and percentage abundances of the isotopes.

Calculate the relative atomic mass (A_r) of metal M. Give your answer to 1 decimal place.

This question is about atomic structure. Figure 1 represents an atom of element Z.

Name the parts of the atom labelled A and B. Choose answers from the box.

Which particle has the lowest mass? Choose the answer from the box.

Which group of the periodic table contains element Z ? Use Figure 1.

Give the atomic number and the mass number of element Z. Use Figure 1. Choose answers from the box.

Bromine has two different types of atom. The atoms have a different number of neutrons but the same number of protons.

What is the name for this type of atom? Tick (✓) one box.

The different types of bromine atom can be represented as⁷⁹₃₅Br and⁸¹₃₅Br The relative atomic mass (A_r) of bromine is 80 Which statement is true about the number of each type of atom in bromine?

Tick (✓) one box.

Figure 3 represents different models of the atom.

Which diagram shows the plum pudding model of the atom?

Tick one box.

Which diagram shows the model of the atom developed from the alpha particle scattering experiment?

Tick one box.

Which diagram shows the model of the atom resulting from Bohr’s work?

Tick one box.

Define the mass number of an atom.

Element X has two isotopes. Their mass numbers are 69 and 71 The percentage abundance of each isotope is:

Estimate the relative atomic mass of element X. Tick one box.

Chadwick’s experimental work on the atom led to a better understanding of isotopes. Explain how his work led to this understanding.