Ni (nikel) ve Fe (demir) aynı element değildir, ancak bunlar ana bileşenleri demir ve nikel olan bir grup alaşım olan demir-nikel alaşımının bileşenleridir 15.
Demir (Fe) bir metaldir çünkü periyodik tablonun 8. grubunda bulunan bir geçiş metalidir. Demirin metalik yapısı, atom çekirdeği etrafında dönen 26 proton ve 26 elektrondan oluşan atomik yapısından kaynaklanır.
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