All atoms of the same element have the same: question 13 options: mass number. mass. number of protons. number of neutrons.

Number of protons

Explanation:

The number of protons (the atomic number) determines the identity of the element.

The number of neutrons may differ, in which case the mass and the mass number (number of protons + neutrons) will differ, but all atoms of the same element will have the same number of protons.

1 a

2 d

3 a

4 c

explanation:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).