An isotope of atom X has a mass number of 18. If the most
stable ion form MgX. How many neutrons does X have.
A.) 19 B.) 10
C.) 11 D.) 18
E.) 9
Element Y has 17 protons. 36 Y-
is isoelectronic with which atom below
S, Al, Ar, Cl, P
An element with the ground state has two unpaired
electrons in the 2p orbital. The element react with fluorine to
form a neutral covalent compound with 20...