1.The correct answer is:b.12
Reason: Atomic mass = number of protons + number of neutrons
Number of neutrons = Atomic mass - number of protons
= 23 - 11 ( since atomic number is 11) = 12 ans.
2.The correct answer is:a.1
Reason: Atomic number is the number of protons present on the nucleus of atom.
3.The correct answer is:a.6
Reason:Number of protons = Number of electrons=6
4.The correct answer is:c.isotopes
Reason: The above relationship of carbon depicts isotopes.
5.The correct answer is:d.23
Reason: Atomic weight = number of protons+ number of neutrons = 11+ 12 = 13(number of electrons= number of protons in neutral atom)
6.The correct answer is:less
Reason: K shell is the first and close to nucleus followed by L and M. Shell far from nucleus possess more energy i.e L.in this case.
7.The correct answer is:d.2-8-4
Reason: K shell will hold 2 , L shell will hold 8 and M shell will hold 4 electrons.
8.The correct answer is:d.8
Reason: L shell can hold 8 electrons.
9.The correct answer is:c.12
Reason: This element with 12 atomic number will have 2 free electrons in outer shell
10.The correct answer is:c.10
Reason: Atomic number 10 refers to Neon.
11.The correct answer is:c.NaCl
Reason.NaCl is a compouns made up of two elements Na and Cl.
12.The correct answer is:b.Mg
Reason:Magnesium loses electrons.
13.The correct answer is:b.reduced
Reason:Chlorine acts as oxidising agent and is reduced.
14.The correct answer is:a.covalent bond--electrons transferred
Reason: Covalent bond--sharing of electrons.
15.The correct answer is: b.Cl
Reason:Halogens can be reduced.
16.The correct answer is: a.easily changed from liquid to gas.
Reason: Water changes from liquid to gas at 100 oC.
Do not refer to the text when taking this test. An element has an atomic number...
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