25. Which of the represent owing represent the Lewis structure for N? B) E) N- 2

Question

25. Which of the represent owing represent the Lewis structure for N? B) E) N- 26. Which of the following represent the Lewis structure for Ca 2? A) Ca:+ B) Ca E) Ca2 27. Which of the following represent the Lewis structure for s 2p B) s- 28. Identify the number of bonding pairs and lone pairs of electrons in water A) 1 bonding pair and I lone pair B) 1 bonding pair and 2 lone pairs C) 2 bonding pairs and 2 lone pairs D) 2 bonding pairs and I lone pair E) 3 bonding pairs and 2 lone pairs 29. Write the formula for the following: ?. ???., NOr

Explanation / Answer

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25 E . This is the righ answer because Nitrogen as 1 valence electron

electronic configuration:1s2 2s2 2p3

26 E is correct because Ca has 2 valence electrons, so Ca2+ has 0.  Elec configuration for Ca is 1s2 2s2 2p6 3s2 3p6 4s2 so for Ca2+ it is  1s2 2s2 2p6 3s2 3p6

27) A is correct because S has 6 valence electrons, so S2- has 8. The electronic configuration of S is Ne 3s2 3p4. so the electronic configuration for S- is Ne 3s2 3p6

28) C 2 bonding pair, 2 lone pairs. The bonding pair the one forming the sigma bond between H and O and there are two lone pairs on O

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