Identify an element with four electrons in the outer subshell.
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a) Chromium (Z=24) contains five electrons in 3d subshell.
(b) Magnesium (Z=12), an alkaline earth metal, can readily lose two electrons to form Mg
2+
.
(c) Oxygen (Z=8) gains 2 electrons to form O
2−
.
(d) Halogens (goup 17) contains metal (iodine), non metals (F,Cl and Br), liquid bromine and gases.
(b) Magnesium (Z=12), an alkaline earth metal, can readily lose two electrons to form Mg
2+
.
(c) Oxygen (Z=8) gains 2 electrons to form O
2−
.
(d) Halogens (goup 17) contains metal (iodine), non metals (F,Cl and Br), liquid bromine and gases.
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