Atoms and Periodic Table – IGCSE Practice Questions

1) Complete the following sentences, using the words below. Each word can be used once, more than once, or not at all.

 All substances are made from _____________ . There are 92 pure substances that are made from ________ of only one type, and these we call _______________. Most pure substances are made from __________ of more than one type chemically bonded together. These are called __________________. Some substances will dissolve in water to form ______________ called solutions.

Words:   elements, compounds, mixtures, solutes atoms, ions

2) Decide whether the following are true or false:

            The lightest subatomic particles are found in the nucleus

            The positively charged particles are found in the nucleus

            Protons have and positive charge and neutrons a negative charge

            Protons and neutrons have the same mass

3) An atom has a mass number of 21 and 10 electrons. Determine how many protons and neutrons this atom has.

4) An atom has an atomic number of 6 and mass number of 13. What can you say about the number of protons, neutrons and electrons in this atom?

5) A sample of the element boron is found to contain 20% of the isotope 10B and 80% of the isotope 11B. Calculate the relative atomic mass of this sample of boron.

6) Identify the following atoms:

In Group 3, has 2 electron shells

In Period 3, has 6 outer shell electrons

In Group 5, has 7 electrons

Has 18 electrons

Has 3 shells containing electrons, and 2 electrons in the outer shell

7) How many outer shell electrons does the element selenium have in its outer shell?

8) Bismuth is an element in Group 5. Explain how tests of its physical properties might allow you to determine whether bismuth is a metal or a non-metal.

9) French scientist Antoine Lavoisier was experimenting with an element he called azote. Explain how tests of its chemical properties would help to determine whether azote was a metal or a non-metal.

10) In 2016 names were given to the elements with atomic numbers 113. 115, 117 and 118. Element 118 is a member of Group 8/0 – the Noble Gases. It has been named Oganesson. Using your knowledge of the Noble Gases, predict what the chemical and physical properties of Oganesson will be.

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