Question

The atomic number of an element is 20.write its electronic configuration .state whether this element is a metal or a non-metal .what is its valency?write the name and formula of the compound which this element form with chlorine?​

Answer 1

The element is calcium(Ca)

(a)2,8,8,2 or $1s 2s²2p6 3s2 3p6 4s2$

(b)It is a metal

(c)$CaCl2$

(d)calcium is more reactive than magnesium since it has another shell which means it's easier for calcium to lose electrons, in other words, calcium is more electropositive than magnesium

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Answer 2

Answer:

The element is calcium(Ca)

(a)2,8,8,2 or 1s2s22p63s23p64s2

(b)lt is a metal

(c)CaCl2

(d)calcium is more reactive than magnesium since it has another shell which means it's easier for calcium to lose electrons, in other words, calcium is more electropositive than magnesium