Name:……………………………………………………. Date: ……………………

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The Periodic Table Worksheet This worksheet accompanies The Periodic Table.ppt

1. Fill in the missing words to describe the arrangement of elements in the periodic

table. Refer to the table above to help you with this exercise.

In 1869, Mendeleev published his arrangement of the known elements in a “periodic table”.

Just over ……..…………… elements were arranged using details of their …………..………

and compounds. This table revealed ………………..… in the chemical properties of

elements in the same vertical column.

The elements of the periodic table are arranged in order of ……………..…… atomic number.

The atomic number reflects the number of ………………….. in the nucleus of each atom.

Elements are arranged in rows of increasing atomic number called ………..………….

Elements with similar properties are arranged in the same vertical column, called

……………..…….

Metals are grouped on the left and ………..………… of the periodic table.

Gases are positioned on the ……..…………… of the periodic table (except hydrogen).

Semi-metals are grouped between metals and non-metals and have some properties that

are ……..…………… to both types of element.

He H

changing patterns 50 periods similar centre 100 increasing groups properties repeating patterns far right far left protons

Name:……………………………………………………. Date: ……………………

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2. Refer to the Periodic Table and answer the following questions.

a) Identify the atomic number of the element iron (Fe).

……………………………………………………………………………………………………………

b) Identify the mass number of the element aluminium (Al).

……………………………………………………………………………………………………………

c) What happens to the reactivity of metal down a group?

……………………………………………………………………………………………………………

d) What happens to the reactivity of non-metals down a group?

……………………………………………………………………………………………………………

3. Electrons are arranged in shells around an atom’s nucleus. Each shell has a maximum number of electrons that it is able to hold. a) Label the diagram below indicating the name of each shell and the maximum number of electrons it can hold:

b) How would you write the electron arrangement for this atom? ……………………………………………………………………………………………………….…

Name:……………………………………………………. Date: ……………………

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4. a) What is the link between the group to which an element belongs in the periodic table and the number of electrons in an atom of the element’s outer shell?

……………………………………………………………………………………………………………

……………………………………………………………………………………………………………

b) Complete the following sentences.

i) Down a group, the number of outer shell electrons is the same, but the number of

complete shells ………………… by one.

ii) Across a period, the number of electrons increases but the number of complete shells

………………….

c) What group is calcium (Ca) in and how many electrons does it have in its outer shell? ……………………………………………………………………………………………………………

d) What are Group 1 elements called?

……………………………………………………………………………………………………………

e) What is the electron configuration for the element magnesium (Mg)? Circle the correct answer. 2,4 2,8,2 2,8,1

f) What is the electron configuration for the element Argon (Ar)?

………………………………………………………………………………………………

Mg

Ar

Ca