Proton

Q.

Whats is $\frac{e}{m}$ value for electrons ?

Q.

What is an electron, proton and neutron? [3 MARKS]

Q.

Compare an electron, a proton, and a neutron in respect of their relative masses and charges.

Q.

State any 10 difference s between atoms, molecules and ions?

Q. Why do cathode rays do not depend upon the material of cathode and anode or the type of gas taken in the discharge tube while the canal rays depend?

Q.

How many times a proton is heavier than an electron?

Q. How many electrons are present in 9g of water

Q. In an atom, the atomic number of an atom is equal to the number of _____.

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

Q.

If A=23 and Z=11 for Na atom, how many neutrons are present in Na atom?

__

Q.

Which is the correct statement about proton?

1. Proton is the nucleus of deuterium

2. Proton is a-particle

3. Proton is an ionized hydrogen molecule

4. Proton is an ionized hydrogen atom

Q. Explain what is atomic mass ?

Q.

What is the atomic number of hydrogen?

Q.

Explain the formation of chloride ion from chlorine atom.

Q.

Give the mass and charge of the fundamental particles of an atom.

Q.

Question 1
Compare the properties of electrons, protons and neutrons?

Q.

Radius of the nucleus is about _______ times less than the radius of the atom.

1. 10⁵

2. 10^-5

3. 10^-15

4. 10^-10

Q.

What is the positive charge on the nucleus of an atom due to?

Q.

What is the significance of the number of protons found in the atoms of different elements ?

Q.

Atoms of the same element can have the same atomic number but a different mass number.

Q.

What is a proton? State the relative mass and charge.

Q.

One electron is present in the outermost shell of the atom of an element $\mathrm{X}$. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?

Q.

The atomic number of magnesium is 12. The number of protons in the nucleus of the magnesium atom is:

Q.

How does a proton differ from an electron?

Q.

Name the scientists who discovered:

(a) Nucleus of atom.

Q.

What is the mass of a proton?

Q.

Name the particles which actually determine the mass of an atom?

Q.

Goldstein's experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

1. electron

2. proton
   

3. nucleus
   

4. neutron

Q.

Isotopes of an element have always the same number of protons.

1. True
2. False

Q.

The increasing order of the energy levels in an atom is _______ .

1. L < M < N < K

2. K < L < M < N

3. L > M > N > K

4. K > L > M > N

Q.

A particle M has 18 electrons, 20 neutrons and 19 protons. This particle must be a:

1. Molecule

2. Anion

3. Cation

4. Compound