Building Blocks 1c
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8
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15
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Int 2
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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
35
17
Cl
Calculate the number of
protons, electrons and
neutrons in the atom
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
1
2
3
4
5
6
7
Number of outer electrons
1
2
3
4
5
6
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
Building Blocks 1c
1
8
2
9
4
3
10
15
11
16
Int 2
5
6
7
12
13
14
17