An atom that has 13 protons and 15 neutrons is isotope of the element
a. nickel
b. silicon
c. aluminum
d. phosphorus. why?

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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)

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter