P
C
R
S
Correct answer is D
It is because the tendency to loss electrons increases with an increase in atomic size and atomic increase down the group
belongs to group VI in the Periodic Table
belongs to periodic Table
contains 3 unpaired electrons in the ground state
has atomic number 27
Correct answer is A
No explanation has been provided for this answer.
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
32
22
20
10
Correct answer is B
No explanation has been provided for this answer.
Allotropes of an element differ in their
physical properties
chemical properties
mass numbers
electronic configuration
Correct answer is A
No explanation has been provided for this answer.
A plastic which cannot be softened by heat is described as
thermosetting
non-biodegradable
thermoplastic
malleable
Correct answer is A
No explanation has been provided for this answer.