Compared to the charge and mass of a proton, an electron has...

A proton has approximately the same mass as

When electrons in an atom in an excited state fall to lower energy levels, energy is

Which atom contains exactly 15 protons?

An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?

Which element has the highest first ionization energy?

Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms'

An atom of which of the following elements has the greatest ability to attract electrons?

What are the columns of the periodic table called?

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