Chemistry
An element has 2 electrons in its N shell.
(i) What is its atomic number ?
(ii) State its position in periodic table
(iii) Is it a metal or a non-metal ?
(iv) State the name assigned to this group.
(v) What is the valency of this element ?
Periodic Table
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Answer
(i) Atomic Number is 20.
(ii) It belongs to group 2 and fourth period.
(iii) It is a metal.
(iv) The name assigned to this group is IIA.
(v) Valency is 2.
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Related Questions
How do the following vary on moving from left to right in the third period of the periodic table : (i) valence electrons and (ii) valency
Name the type of elements, which have their
(i) outermost shell complete
(ii) outermost shell incomplete
(iii) two outermost shell incomplete
(iv) one electron short of octet
(v) two electrons in the outermost orbit.
Answer the following in respect of element .
(i) Give its electronic configuration.
(ii) To which group and period does it belong ?
(iii) What is its valency ?
(iv) Is it a metal or a non-metal ?
(v) Is it a reducing agent or an oxidising agent ?
(vi) Give its formula with hydrogen.
Name
(a) An alkali metal in period 3 and halogen in period 2.
(b) The noble gas with 3 shells.
(c) The non-metals present in period 2 and metals in period 3.
(d) The element of period 3 with valency 4.
(e) The element in period 3 which does not form oxide.
(f) The element of lower nuclear charge out of Be and Mg.