What is the mass number of a cobalt atom that has 27 protons and
30 neutrons?

An experimental procedure requires a 10 ml of acid to be dissolved

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.