3rd Form Chemistry Common Task 1

State how the diagram shows that both of these atoms are neutral.

Explain how the diagram shows that these atoms are isotopes.

Complete the table to show the atomic number and mass number of atoms 1 and 2.

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

The boxes list changes that may happen in a laboratory and the names of some changes. Draw one straight line from each change to its correct name.

The diagram shows part of the Periodic Table, with elements represented by the letters L, M, Q, R and T. The letters in the diagram represent elements but are not their chemical symbols. Use the Periodic Table to help you answer this question.

Which of the letters represent a non-metal

• L

• Q

• T

• R

• M

Name the part of the of the atom that is labelled Z

Number of protons in this atom

• 2

• 8

• 10

• 12

Number of the group that contains this element

• 1

• 2

• 3

• 8

Number of the period that contains this element

• 1

• 2

• 3

• 8