Chemistry
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.
Answer
(a) Alkali metal in period 3 = Sodium
Halogen in period 2 = Fluorine
(b) Argon (Ar).
(c) Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne) are non-metals in period 2.
Sodium (Na), Magnesium (Mg) and Aluminium (Al)are metals in period 3.
(d) Silicon (Si).
(e) Argon (Ar).
(f) Be will have lower nuclear charge then Mg.
Related Questions
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 ?
The electronic configuration of the element T is 2, 8, 8, 1.
(i) What is the group number of T ?
(ii) What is the period number of T ?
(iii) How many valence electrons are there in an atom of T ?
(iv) What is the valency of T ?
(v) Is it a metal or a non-metal ?
Match the atomic number 19, 15, 8, 4, and 2 with each of the following :
(i) A metal of valency one.
(ii) A solid non-metal of period 3.
(iii) A rare gas.
(iv) A gaseous element with valency 2.
(v) An element of group 2.