Atomic structure – test yourself.
1. K is the chemical symbol for potassium.
The mass number is the total number of __________ and ____________ inside the potassium
atom.
How many protons are there in an atom of potassium ________
How many neutrons are there in this atom of potassium? ________
How many electrons are there in this atom of potassium? _________
A different isotope of potassium has a mass number of 40. How many protons are in this isotope
of potassium? _________
16
2. Describe the structure of an oxygen atom 8
. (4 marks)
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O
3. The table gives some information about two isotopes of the element Chlorine.
Isotope
Mass number
Atomic number
Chlorine 35
Chlorine 37
35
17
37
17
How many electrons are there in an atom of Chlorine-35? __________
How many neutrons are there in an atom of Chlorine-35? __________
How many protons are there in an atom of Chlorine-37? __________
How many neutrons are there in an atom of Chlorine-37? __________
If an atom of Chlorine gains an electron it becomes a chloride ________ .
C is the chemical symbol for a carbon atom. In the periodic table the letter C has 2 numbers
next to it, these are shown by the letters Y and Z .
y
z
The letter Z represents a number called the ___________ number
C
The letter Y represents a number called the ___________ number
In all carbon atoms the number Z is always 6. Explain why
______________________________________________________________________________
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In some carbon atoms the number Y is 12 (carbon-12) and sometimes 14 (carbon 14) .what is the
difference between an atom of carbon-12 and an atom of carbon-14?
_______________________________________
What is the name for atoms of the same element that have different mass numbers ___________