Advertisements
Advertisements
प्रश्न
The atoms of which of the following pair of elements are most likely to exist in free state ?
पर्याय
hydrogen and helium
argon and carbon
neon and nitrogen
helium and neon
Advertisements
उत्तर
helium and neon
Atoms of helium and neon exist in a free state because they are inert gases and chemically inactive.
APPEARS IN
संबंधित प्रश्न
Give the names and symbols of the first twenty elements of the periodic table.
Give the symbol and the number of atoms of the following elements present in sodium chloride.
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
Ca2+ NO31-
State which element exists in the highest percentage in human body.
State the type of element for the following:
Neon
State the type of element for the following:
Radon
Write the radical of the following valency:
Bromine [Bromide]
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Bromide
What is meant by the term ‘symbol’?
