A.
C.
e.
Aliwel ule IUUUWWg questions.
Define valency.
b. What is the valency o...
Chemistry, 04.12.2020 06:30 kieramacphee6216
A.
C.
e.
Aliwel ule IUUUWWg questions.
Define valency.
b. What is the valency of aluminium and nitrate in Al (NO),?
How many electron pairs are shared by an oxygen molecule?
d. The valency of fluorine is 1. What is its valence electron?
What are radical and ions?
f. Define
i, element ii. compound iii. symbol
iv. molecule
V. atom vi. metals vii. electrovalent compound
ix. chemical bond x. metalloids
g.
What are radicals? Mention their types.
h. What is valency? Write the valency of the following radicals and elements.
CO, PO, Na, H, O, OH, NH, CI, Ca, Al, Si, Hg (ic), NO,
148 Modern Graded Science Class 9
viii. covalent compound
Answers: 3
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1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false
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This drawing shows a human body system. what is the primary function of this body system?
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