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Relative Mass:1
Relative Charge:+1

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Relative Mass:1
Relative Charge:0

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Relative Mass: 1/1840
Relative Charge: -1

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Relative mass= number of proton + number of neutrons

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Isotopes have the same number of protons but different number of neutrons
Eg
17 17
Cl Cl
35 37

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5 6
x x
7 7
Are they isotopes?
No.They have different no. of protons so they are different elements

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E.g: 2
He
Helium
4

2= proton(atomic)number
He= atomic symbol
Helium= name
4= relative mass

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The group number at the top of the periodic table is how many electrons there are on the outer shell
Eg
What is special about group 7?
The elements in group 7 has 7 electrons on the outer shell.

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First shell: 2 electrons
Second shell:8 electrons
3rd shell:8 electrons
4th shell 18 electrons

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Nucleon number= atomic mass

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ION : an atom or molecule with a net electric charge due to lose or gain of one or more electrons

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When an atom loses or gains electrons it becomes an ion

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Lose eletrons as it is easier to lose an electron than to gain an electron to become a stable atom

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Will gain electrons as it is easier to gain electrons than to lose electrons to become a stable atom