Building Blocks 1c Int 2

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Building Blocks 1c Int 2
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Name the particles which make up an element?
Atom
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Name the three sub atomic particles found in an
atom.
Proton, electron and neutrons.
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Name the particles found in the nucleus
Protons and neutrons
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Where are the electrons in an atom?
Outside the nucleus
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State the charge and mass of a proton, neutron
and an electron.
Mass charge proton 1
1 electron 0
1- neutron 1 no charge
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Which number identifies an element?
Atomic number
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Why are atoms neutral?
They have the same number of positive charges and
negative charges
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What does the atomic number tell you about an
atom?
The number of positive protons in the nucleus
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What is the mass number of an atom?
The number of protons and the number of neutrons
added together
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If an atom has an atomic number of 12, how many
electrons are there?
12
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An element has a mass number of 19 and an atomic
number of 9. How many neutrons is in the atom.
19 - 9 10
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Cl
Calculate the number of protons, electrons and
neutrons in the atom
protons 17 electron 17
neutrons 18
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Why do potassium and sodium have similar chemical
properties?
They have the same number of outer electrons.
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How many outer electrons do the elements in
groups 1 to 7 have?
Group Number of outer electrons 1 1

2 2 3 3
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6 6
7 7



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What are isotopes?
Atoms of the same element with the same atomic
number but different mass numbers.
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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.
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What term is used to describe atoms of the same
element with different mass numbers.
Isotopes
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