The number of protons in an atom is called

isotopes of carbon 12 and carbon 14 they differ from one another by the number of

the maximum number of electrons in the second energy level of an atom is

elements arranged in vertical columns in the periodic table are called

Which of the three subatomic particles are neutral

Which of the three subatomic particles are positive

The central core of the atom is called the

An atom with 26 protons, 26, electons, and 30 neutrons has a mass number

Elements in groups 3 through 12 are called

Atoms of the same element with a different number of neutrons are called

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