Question

Fill in the blanks:

(i) Each ___________ in the periodic table is comprised of elements having the same number of electron shells.
(ii) Elements in a group, all have the same number of __________.
(iii) The metallic character _________ down a group and it ___________ across a period. (iv)The amount of energy involved in the reaction X + energy X+ + e- is known as
the ________________ of the element X.
(v) Across a period, the electron enthalpy _________.
(vi)The tendency to gain an electron ________ on moving down a group and _________
on moving across a period in the periodic table.
(vii) The higher the electron affinity of a non-metal, _________ chemically reactive
the non-metal is.
(viii) The similarities in the properties of group of elements are because they have the
same _____________.
(ix) The most metallic element in the third period is ___________.
(x) Element X belongs to group 2 and period 3 of the periodic table. It has ________
electrons in the outermost shell

Answer 1

Answer:

1

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.