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How do i turn 2 s into one in the products

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+

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?