Atom

Q.

How do you find the number of protons, electrons, and neutrons of a particular atom, if all you are given is the atomic number and mass number?

Q. Which subatomic particles have approximately the same mass?

1. Protons and neutrons
2. Protons and electrons
3. Electrons and neutrons
4. Electrons and nucleons

Q.

How does the metallic (or electropositive) character of metals change as we go from top to bottom in the activity series of metals?

Q. Gold is more reactive than sodium.

1. True
2. False

Q. When a metal A reacts with salt solution of metal B, it displaces B, while metal C reacts replaces A from its salt, so the activity order will be

1. C > A > B
2. B > A > C
3. C > B > A
4. A > B > C

Q.

If an atom contains one electron and one proton, will it carry any charge or not?

Q. The chemical properties and atomic masses of oxygen and carbon are different. This was explained in:

1. Dalton's atomic theory
2. Thomson's atomic theory
3. Rutherford's atomic theory
4. Bohr's atomic theory

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

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

Q. Statement 1: An iron rod contains only iron atoms in it.

Statement 2: A glass of water contains only oxygen atoms in it.

1. Statement 1 is true, statement 2 is false
2. Statement 2 is true, statement 1 is false
3. Both statements are true
4. Both statements are false

Q. Identify the least reactive metal from the following.

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

Q. Statement I: A neutral atom carries no net charge.
Statement II: An atom that has equal number of protons and electrons is called a neutral atom.

1. Statement I is true and statement II is the correct explanation.
2. Statement I is false and statement II is true.
3. Statement I is true and statement II is not the correct explanation.
4. Statement I is true and statement II is false.

Q. The electrical charge of an atom with equal number of protons and electrons will be _________.

1. 0
2. 1
3. -1
4. 2

Q. Iron is less reactive than _____.

1. Copper
2. Gold
3. Silver
4. Magnesium

Q. Atomic number is represented by the letter X.

1. True
2. False

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. 6 u

2. 8 u

3. 12 u

4. 14 u

Q. Statement 1: An iron rod contains only iron atoms in it.

Statement 2: A glass of water contains only oxygen atoms in it.

1. Statement 2 is true, statement 1 is false
2. Both statements are true
3. Statement 1 is true, statement 2 is false
4. Both statements are false

Q.

Which of the following metals will displace Zinc from its salt?

1. Aluminium

2. Lead

3. Magnesium

4. Tin

Q.

Rutherford's proved that atoms have ___.

1. neutral centre

2. no positive charge present

3. negatively charged centre

4. positively charged centre

Q. The atomic number of sodium is 11. What is the electrical charge of its atom?

1. 0
2. 1
3. -1
4. -2

Q. Match the sub-atomic particles with the scientists who discovered them:

1. J.J. Thomson
2. E. Goldstein
3. J. Chadwick

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

1. electrons
2. protons
3. neutrons
4. nucleus

Q.

Which of the following are considered as the fundamental building blocks of matter?

1. Compounds

2. Atoms

3. Molecules

4. Elements

Q.

Thomson compared atom to watermelon and thus derived some conclusions. Which of the following were his conclusions?

1. The seeds and edible part both are electrons.
2. The seeds and edible part both are positive charge.
3. The seeds are positive spheres and red edible parts are the electrons.
4. The seeds are the electrons and red edible part is the positive sphere.

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

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