l only
l and ll only
l, ll and lll only
l, ll, lll, and IV
Correct answer is B
No explanation has been provided for this answer.
Which of the following features of a human skeleton can be determined by carbon-dating?
Height
Mass
Age
Race
Correct answer is C
No explanation has been provided for this answer.
alpha particles and gamma rays
alpha and beta particles
beta particles and gamma rays
alpha particles only
Correct answer is C
No explanation has been provided for this answer.
Which of the following compounds is covalent?
CaCI2
MgO
NaN
CH4
Correct answer is D
No explanation has been provided for this answer.
What is responsible for metallic bonding?
Sharing of electrons between the metal atoms
Attraction between the atomic unclei and cloud of electrons
transfer of electrons from one atom to another
Attraction between positive and negative ions
Correct answer is B
No explanation has been provided for this answer.