The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
atomic structure
metallurgy
periodic table of contents
discovery of elements
Correct answer is C
No explanation has been provided for this answer.
The molecular formula of phosphorous is
P1
P2
P3
P4
Correct answer is D
No explanation has been provided for this answer.
The inert gases are ____ in water
sparingly soluble
insoluble
soluble
None of these
Correct answer is A
No explanation has been provided for this answer.
The metal that is usually extracted from sea water is
Ca
Na
K
Mg
Correct answer is D
No explanation has been provided for this answer.
The formula C6H5-CO-CH3 represents
Acetone
Acetic acid
Acetophenone
Phenyl acetate
Correct answer is C
No explanation has been provided for this answer.
The maximum number of covalent formed by nitrogen is
1
2
3
4
Correct answer is D
No explanation has been provided for this answer.
The mass number of an atom is equal to
the number of protons
the number of protons and electrons
the number of nucleons
the number of neutrons
Correct answer is C
No explanation has been provided for this answer.
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