We learnt about the periodic table and the elements in this term. There are 8 groups in the periodic table. They are grouped according to their properties and the number of valence electrons they have. Group 1 and 2 are metals and group 8 is noble gases. The period are grouped according to the number of filled electron shells it have and also it increases in the number of valence electrons as the elements moves from left to right.
The number " 16 " on top is the mass number. The mass number is made up of the number of protons plus the number of neutrons. Isotopes are atoms from the same element and have the same number of protons and electrons but have different number of neutrons. The number " 8 " below is the atomic number. It is the number of protons the atom has. Normally, the number of protons would also be the same as the number of electrons. Ions are atoms when the number of electrons is not the same as the number of proton hence it would either be positive if it loses an electron or negative if it gains an electron.
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