Atomic structure questions | form two Chemistry

The correct statement about metals is that:-
A. React with acids to give gases.
B. React with acids to give hydrogen gas.
C. Have more than one valency.
D. All have magnetism.

Answer / Solution

UNSOLVED

One isotope of an element has atomic number A and mass number M. How many neutrons are contained in the nucleus of its atom?
A. M
B. A
C. A – M
D. M – A

Answer / Solution

UNSOLVED

The total number of protons and neutrons in the nucleus of an atom is called:
A. valency number
B. atomic number
C. molecule number
D. mass number

Answer / Solution

UNSOLVED

The mass number of a carbon atom that contains six protons, eight neutrons, and six electrons is

1. 6
2. 14
3. 8
4. 12
5. 20

Answer / Solution

2. 14

Which of the following chemical species have the same number of electrons.

1. K⁺ , Ca²⁺ , Cl^- and Ar
2. Cl, Be and O^2-
3. O^2- , Ca²⁺ and Mg²⁺
4. Na⁺ , Mg²⁺ , Be²⁺ and Li

Answer / Solution

UNSOLVED