4. Atoms and Elements

In an atom, the major portion of the atom's mass consists of which subatomic particles?

Which subatomic particle in an atom has a positive charge?

Which subatomic particle in an atom has a negative charge?

In a simplified model of the atom, which subatomic particle is typically described as moving the fastest?

In a simplified model of the atom, which subatomic particle has a negative charge?

In a simplified model of subatomic particles, what is the relative mass of an electron compared with a proton (proton $=1$)?

How many protons are in an atom of phosphorus (P)?

A positively charged particle in an atom is the:

Which element has 31 protons in its nucleus?

In simplified terms using relative masses (with the proton as the reference), what is the relative mass of a proton?

Atoms of which element contain 25 protons?

How many protons are in an atom of bismuth (Bi)?

Which neutral element has 35 electrons?

How many protons are in a neutral atom of calcium (Ca)?

Which element has $50$ protons in its nucleus?