Characteristics of Subatomic Particles

Q.

Which has maximum number of atoms of oxygen?

1. $10\mathrm{mL}{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

2. $0.1\mathrm{mole}\mathrm{of}{\mathrm{V}}_2{\mathrm{O}}_5$

3. $12\mathrm{g}{\mathrm{O}}_3\left(\mathrm{g}\right)$

4. $12.044\times {10}^{22}\mathrm{molecules}\mathrm{of}{\mathrm{CO}}_2$

Q.

An atom is made up of

1. Only of electrons

2. Of protons, electrons and of neutrons

3. Only of protons

4. Of protons and electrons only

Q.

Which particles have approximately the same size and mass?

1. electrons and neucleons

2. protons and electrons

3. protons and neutrons

4. electrons and neutrons

Q.

The atomicity of helium is:

1. 1

2. 2

3. 3

4. 0

Q. Which of the following statement(s) are true regarding electrons?

1. They are negatively charged particles.
2. Their relative mass is $\frac{1}{12}$ times that of a hydrogen atom.
3. They are present at the center of an atom.
4. Sir J. J. Thomson discovered electrons.

Q.

Which of the following statements is/ are correct about neutral elements?

(i) Atomic number = number of protons = number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic number = number of protons + number of electrons
(iv) Mass number = number of neutrons = number of electrons

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iv)
4. (ii) and (iv)

Q.

An atom has a mass number $A$ and atomic number $Z$.

How many electrons are revolving around the nucleus?

Q.

Protons and neutrons are collectively known as _________.

Q.

An element has 20 electrons and 20 neutrons. It is electrically neutral

The atomic number of elements is?

Q.

Define electrons.

Q.

What is the relation between the number of protons and the number of electrons in an atom?

Q. Choose the correct statement(s) from the options given below.

1. Statement 1 is correct and statement 2 is wrong.
2. Statement 1 is wrong and statement 2 is correct.
3. Both statement 1 and statement 2 are correct.
4. Both statement 1 and statement 2 are wrong.

Q. Which of the following are sub-atomic particles of an atom?

1. Electrons
2. Nucleus
3. Protons
4. Neutrons

Q. What are isoelectronic species ?

Q. Atoms have electrons, protons, and neutrons as the fundamental particles. The net electrical charge on an atom is:

1. Positive
2. Negative
3. Neutral
4. Cannot be predicted

Q. The relative mass of a proton is:

1. 1 amu
2. 24 amu
3. 12 amu
4. 6 amu

Q.

Identify the element given below.

1. Hydrogen
2. Helium
3. Carbon
4. Lithium

Q. Charge of a neutron is

1. positive
2. negative
3. either positive or negative
4. neutral

Q.

Select the correct statement(s) regarding the electrical charge of electrons and protons.

1. Electrons are positively charged.

2. Electrons are negatively charged.

3. Protons are positively charged.

4. Protons are negatively charged.

Q. The mass of an electron is _________ times the mass of a proton.

1. 1840
2. $\frac{1}{1840}$
3. $\frac{1}{184}$
4. 184