Difference between atomic number and atomic weight?

The nucleus contains protons and neutrons. ... The main difference between atomic number and atomic weight is that atomic number gives the number of protons present in the nucleus whereas atomic weight gives the mass of an atom.

Explanation:

Atomic number refers to the number of electrons or number of protons, both of which are the same. Atomic weight refers to the total mass of protons and neutrons in an atom, which are focused in the nucleus of the atom (and take most of the mass).

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)