Atom

Q. Number of neutrons is always greater than or equal to the number of protons.

1. True
2. False

Q. The number of neutrons present in carbon-14 are _______.

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

Q.

Give characteristics of neutron.

Q. An element 'X’ with mass number of 27 has 14 neutrons. How many electrons does X have? ​

1. 14
2. 15
3. 13
4. 12

Q.

7(c) Define the term nucleons.

Q.

The atomic number of an atom is 19 and its mass number is 39. Which of the following are correct?

1. Number of neutrons = 19

2. Number of electrons = 20

3. Number of protons = 19

4. Number of neutrons = 20

Q. Statement 1 (S1): Gold is represented by the symbol ‘AU’.
Statement 2 (S2):​ The symbol of gold is originated from the Latin word ‘Aurum’.​

Q. Identify the least reactive metal from the following.

Q. Dalton's claim that atoms of different elements are different in all respects has been proved wrong because of :

1. isotopes
2. allotrope
3. isobars
4. all of the above

Q. Identify the least reactive metal from the following.

1. Potassium
2. Gold
3. Zinc
4. Iron

Q. Element Y accepts 3 electrons from element X to form a molecule. Guess the element Y and X from the options given below.

Q.

If the number of electrons in a neutral atom is 6 and the number of neutrons is 8. Then the atomic mass of that element will be ___.

1. 14 u

2. 6 u

3. 8 u

4. 12 u