Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
(if this help pls mark as brainliest :))
2 stands for valency of ca ion
its +2
that it takes two electrons to complete its shell
Answer:
monomers
Explanation:
Thousands of molecules are called monomers
Density
=mass÷volume
=19.67÷5.90
=3.33 g/ml
