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Name the particles which make up an element?

Atom

Name the three sub atomic particles found in an atom.

Proton, electron and neutrons.

Name the particles found in the nucleus

Protons and neutrons

Where are the electrons in an atom?

Outside the nucleus

State the charge and mass of a proton, neutron and an electron.

Mass charge

proton 1 1+

electron 0 1-

neutron 1 no charge

Which number identifies an element?

Atomic number

Why are atoms neutral?

They have the same number of positive

charges and negative charges

What does the atomic number tell you about an atom?

The number of positive protons in the nucleus

What is the mass number of an atom?

The number of protons and the number of neutrons

added together

If an atom has an atomic number of 12, how many electrons are there?

12

An element has a mass number of 19 and an atomic number of 9.

How many neutrons is in the atom.

19 - 9 =10

Cl

Calculate the number of protons, electrons and neutrons in the atom

3517

protons = 17 electron = 17

neutrons = 18

Why do potassium and sodium have similar chemical properties?

They have the same number

of outer electrons.

How many outer electrons do the elements in groups 1 to 7 have?

Group Number of outer electrons

1 1 2 2 3 3 4 4 5 5 6 6 7 7

What are isotopes?

Atoms of the same element with the same

atomic number but different mass numbers.

Explain why strontium has a relative atomic mass of 87.6 yet no strontium

atom has this mass?

Elements are made up of isotopes with different mass

numbers. 87.6 is the average mass of

the isotopes.

What term is used to describe atoms of the same element with

different mass numbers.

Isotopes

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