Question

number of protons neutrons and electrons in the element is ​

Answer 1

Answer:

The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic mass is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.

...

2.1 Electrons, Protons, Neutrons, and Atoms.

Element .

Symbol .

Atomic No. .

Number of Electrons in Each Shell First .

Second .