Anonmetal

has 10 electrons and 8 neutrons, find the atomic no. and the mass no. of the element x. also identify the element x.

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Oxygen-16 is the atom in question.

The superscript of the ion says "2-". That means that the ion here carries a charge of -2.

There are 10 electrons in total in that ion. There are two more electrons than protons. That means that there are 10 - 2 = 8 protons in that ion.

The atomic number of an atom is the same as its number of protons. The atomic number of X is 8.

The atomic number determines the element. Atomic number 8 is oxygen. Thus element X is oxygen.

Mass number is the sum of number of protons and neutrons in an atom. 8 + 8 = 16 for this atom.

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