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Question
Elements A, B and C have atomic number 17, 19 and 10 respectively.
- State which one is:
- a non-metal
- a metal,
- chemically inert?
-
Write down the formula of the compound formed by two of the above elements.
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Solution
The electronic configuration of:
A (17) = 2, 8, 7
B (19) = 2, 8, 8, 1
C (10) = 2, 8
-
- Element A has 7 electrons in its outermost shell it is a non-metal.
- Element B is a metal because there is only 1 valence electron in B.
- Eklement C is chemically inert element because there are 8 valence electrons in C.
- 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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