What do the numbers listed for an element on the periodic table represent
2 answers:
There are usually two values you'll come across on the periodic table.
1. the atomic number.
this represents the number of protons an element has. For example, hydrogen (H) has an atomic number of 1, which means that hydrogen has only one proton.
2. the mass number.
this usually represents the number of protons and neutrons an element has. For example, carbon (C) has a mass number of roughly 12, which means that the sum of its protons and neutrons add up to about 12. We know carbon has an atomic number of 6 (6 protons) so the number of neutrons must be 6 aswell.
(the mass numbers can differ depending on which periodic table you are given)
1. the atomic number.
this represents the number of protons an element has. For example, hydrogen (H) has an atomic number of 1, which means that hydrogen has only one proton.
2. the mass number.
this usually represents the number of protons and neutrons an element has. For example, carbon (C) has a mass number of roughly 12, which means that the sum of its protons and neutrons add up to about 12. We know carbon has an atomic number of 6 (6 protons) so the number of neutrons must be 6 aswell.
(the mass numbers can differ depending on which periodic table you are given)
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Answer:A
Explanation:
A nuclear reaction is balanced by ensuring that the Masses and charges of te reactants and products are exactly balanced on the left and right hand side of the reaction equation. If there are 60 mass units on the LHS and manganese has only 56 mass units then four mass units are left. If there is no charge on a neutron and there is a charge of 27 on the cobalt, then two charges are left. Four mass units and a charge of +2 corresponds to a helium which is actually an alpha particle.
