Neutron

Q.

Give an atomic number, atomic symbol, atomic mass of the first 20 elements.

Q.

(b) Mention any three applications of radioactive isotopes.

Q.

The total number of protons and neutrons in the nucleus of an atom is called ?

Q.

Calculate the number of oxygen atoms in 0.10 mole of ${Na}_{2}C{O}_3.10H_{2}0$

Q.

How are the number of protons, electrons and neutrons calculated?

Q. A subatomic particle 'A' was discovered by James Chadwick. The charge on 'A' is

1. 
   $-1.6\times {10}^{-19}C$
2. 
   $+1.6\times {10}^{-19}C$
3. 
   $-9.1\times {10}^{-19}C$
4. 
   Zero

Q.

What is a proton? How does it differ from a neutron?

Q.

What are radioactive isotopes ? Mention its ap­plications.

Q.

An element has atomic number 19 and mass number 39. How many electrons and protons are present in its unipositive ion?

Q.

Protons and neutrons are together called as__.

Q.

Which subatomic particle is not present in an ordinary hydrogen atom?

Q.

The number of neutrons in the atoms of an element is equal to its atomic number. True or False.

1. True

2. False

Q.

What is a neutron? State its relative mass and charge.

Q.

The protons and neutrons are present together in the nucleus. They are collectively known as..................

__

Q.

4. The positively charged particle within the nucleus of an atom is called neutron.

1. True
2. False

Q.

In the representation of a neutron: ${}_0{n}^1$ 1 represents the mass and 0 represents the:

1. atomic number
2. electrical charge
3. magnetic charge
4. mass number

Q.

The electric charge on a proton is_________

1. 1.67 x 10 ^-24

2. +1.6 x 10^-19

3. 6.028 x 10^-28

4. Zero.

Q.

What are nucleons? How many nucleons are present in phosphorus ? Draw its structure.

Q.

During a chemical reaction overall mass of the product formed is______________ to that of reactants.

1. equal to

2. greater than

3. less than

4. sometimes less than sometimes greater than

Q.

Name the particles which determine the mass of an atom.

Q. Which has more number of atoms, 100 grams of sodium or 100 grams of iron

Q.

An element B has 5 protons and 6 neutrons. What will be the symbol of the element B?

1. ¹¹₆B

2. 11B

3. ⁵₁₁B

4. ¹¹₅B

Q.

Assertion (A): A neutron is neutral in nature.​
Reason (R): A neutron is formed by an electron and a ​proton combining together.

Q. You tell me that An alpha particle is just a helium nucleus without any electrons -- two protons and two neutrons. But well ruther Ford was experimenting the gold foil experiment that time neutron was not discovered so how they get that Alpha particle is made up of 2 protons and 2 neutrons

Q.

Who discovered neutron for the first time?

Q. How does the nucleus of the atom have protons in a certain place shouldn't they be repelling each other as they are of same charge

Q.

Assertion : Cause of production of continuous X-rays is the loss in kinetic energy of electrons during collisions with different nuclei of target.

Reason : A decelerating charged particle radiates electromagnetic waves.

1. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

2. If both Assertion & Reason are True & the Reason is not a correct explanation of the Assertion

3. If Assertion is True but the Reason is False

4. If both Assertion & Reason are false

Q. who discovered proton and neutron eiectrron

Q.

Which of the following scientist discovered neutrons?

1. J.J. Thomson

2. John Dalton

3. Ernest Rutherford

4. J. Chadwick

Q.

State the use of radioactive isotopes in the industry?