Isobars

Q.

Oxygen atom has 8 electrons, 8 protons and 8 neutrons. Find out the mass number of oxygen atom.

Q.

What are isobars? Explain with an example.

Q.

Which of the following pairs are isobars?

1. ${}_{17}C{l}^{35}\&{}_{17}C{l}^{37}$
   
2. ${}_{18}A{r}^{40}\&{}_{18}C{a}^{40}$
   
3. $6C^{12}\&6C^{14}$
   
4. 
   

   None of these

Q.

An isobar has

1. same number of protons but different number of nucleons.

2. same number of nucleons but different number of protons.

3. same number of neutrons but different number of protons.

4. same number of nucleons but different number of neutrons.

Q. Question 31
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Q.

Two atoms are said to be isobars if-

1. they have same atomic number but different mass number

2. they have same number of neutrons but different number of electrons

3. sum of the number of protons and neutrons add neutrons is same but the number of protons is different.

4. they have same number of electrons but different number of neutrons

Q.

Which of the following are isotopes and which are isobars?

Argon, Deuterium, Calcium, Tritium, Protium

Q.

Isobars have similar physical properties. . True or False

1. True

2. False

Q. Which of the following are isotopes and which are isobars ?
argon, protium, calcium, deuterium
Explain why the isotopes have similar chemical properties but they differ in physical properties.

Q.

Composition of the nuclei of two atomic species A and B is given as under

	A	B
Protons	18	20
Neutrons	22	20

How A and B are related to each other?

Q.

What is the symbol of chloride ion?

Q. Which of the following is an isobar of calcium?

1. Chlorine
2. Argon
3. Sulphur
4. Titanium

Q.

Formula of hydride of a halogen in period 3 _________.

Q.

The atomic species A and B have different number of protons but the same number of nucleons. On the other hand, the atomic species X and Y have the same number of protons but different number of nucleons. Which pair is an example of isobars ? Why ?

Q. Explain isotopes and isobars with examples

Q.

Can two atoms have same number of nucleons? Explain.

Q. What are isobars ?

Q.

The atomic number and mass number of sodium are 11 and 23 respectively. Find the number of sub-atomic particles in Sodium.

Q.

What is wrong with the statement ‘l mole of hydrogen’?

Q. $11H,21Hand31H$ are the isobars of hydrogen.

1. False
2. True

Q. What is the difference between isotopes and isobars

Q.

In what respects do the three isotopes of hydrogen differ ?

Q.

Which of the following pairs are isobars ?

$\left(i\right){}_{26}^{58}A,{}_{28}^{58}B\left(ii\right){}_{35}^{79}X,{}_{35}^{80}Y$

Give reasons for your choice.

Q.

The four atomic species can be represented as follows. Out of these, the two species which can be termed isobars are :

(i) ${}_{60}^{201}X$ (ii) ${}_{61}^{200}X$

(iii) ${}_{58}^{200}$ (iv) ${}_{60}^{203}X$

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (i) and (iii)

(d) (i) and (iv)

Q.

The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of :

(a) chemically similar atoms

(b) isotopes

(c) solid and liquid metals

(d) isobars

Q.

Give one word or phrase for the following statement.

Process of formation of ions from molecules which are not in ionic state.

Q.

Statement 1: Isobars have same chemical and physical properties.
Statement 2: Isobars are the atoms with equal number of nucleons.

1. Only Statement 1 is true

2. Only Statement 2 is true

3. Both statements are true
4. Both statements are false

Q. Question 31
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Q. Isobars are:

1. chemically and physically same
2. chemically different but physically same
3. chemically and physically different
4. chemically same but physically different

Q.

There are 3 boxes. In one box there are only isotopes in the other two boxes there are isotones and isobars. Which of the following boxes contains isotones?

1. Box A

2. Box B

3. Box C

4. None of these