The atomic number of an isotope of hydrogen is equal to its mass number because it
has a totally filled valence shell
has a high charge to mass ratio
does not contain neutrons
exhibits isotopy
Correct answer is C
No explanation has been provided for this answer.
\(1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{4}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3d^{4} 4s^{1}\)
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
Correct answer is D
Electronic configuration of Chromium: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
Solubility in water
Melting point
Relative density
Crystalline nature
Correct answer is B
No explanation has been provided for this answer.
Atoms are electrically neutral because they
do not conduct electricity
contain equal number of protons and electrons
are composed of neutrons and electrons
cannot be attracted by electromagnetic field.
Correct answer is B
Atoms are electrically neutral because they contain equal amount of positive and negative charge. This is because they have equal number of protons and electrons.
42
45
126
180
Correct answer is D
Molecular formula = (empirical formula x n)
where n= (1,2,3,...)
\(CH_{2}O = 12 + (2\times 1) + 16 = 30\)
Relative molecular mass = (30 x n)
From the options, only 180 is a multiple of 30, when n=6.