Express 0.001400 in scientific notation 1.4 x 10-3 14 x 10-4 1.400 x 10-3 1400 x 10-6

If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+