14. How many electrons are there in the p-shell of manganese atom?
The answer:12
15. What particles electronic configuration matches with 1s
2
2s
2
2p
6
?
A) O
-2
,N
-3
, Na
+
B) Na
+
, Ba
+2
,F
-
C) Si
+4
, P
+3
, S
+4
The answer:A
16. Which elements have similar chemical properties with an element
possessing electronic structure of 1s
2
2s
2
2p
6
3s
2
3p
3
? The answer:N, As, Sb
17. Show the elements whose electrons moved from 5s level to 4d one.
1) chromium 2) silver 3) vanadium 4) niobium 5) copper 6) titan 7)
molybdenum 8) palladium 9) radon 10) gold. The answer: 2,4,7,8,10
18. Find the element and its number, whose last configuration levels are
...4s
2
4p
2
. The answer: Ge 32
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