Chemistry
Elements A, B and C have atomic numbers 17, 19 and 10 respectively.
(a) State which one is : (i) a non-metal (ii) metal (iii) chemically inert ?
(b) Write down the formula of the compound formed by two of the above elements.
Chemical Bonding
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Answer
The electronic configuration of :
A (17) = 2, 8, 7
B (19) = 2, 8, 8, 1
C (10) = 2, 8
(a) (i) A is a non-metal because there are 7 valence electrons in A.
(a) (ii) B is a metal because there is only 1 valence electron in B.
(a) (iii) C is chemically inert element because there are 8 valence electrons in C.
(b) The formula of the compound formed by two of the above elements is BA. The reason being, B loses an electron and A gains that electron to form an ionic bond.
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