Atom

Q.

What is the symbol of Gold?

1. Au

2. G

3. Hg

4. Gd

Q. Modern atomic symbols are based on the method proposed by ____.

1. Berzelius
2. alchemists
3. Bohr
4. Dalton

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. 8 u

2. 6 u

3. 12 u

4. 14 u

Q.

What is/are the postulates of Modern Atomic Theory?

1. Atoms are indivisible

2. An atom can be created and destroyed by Fusion or Fission.

3. Atoms of an element are all alike

4. Laws of chemical combination may not always be followed

Q.

Name the Irish scientist who is considered as the 'Father of Chemistry' and proposed the first modern definition of an element.

1. George Boole

2. Albert Einstein

3. Robert Boyle

4. Isaac Newton

Q. Which of the following element exhibit variable valency?

1. Iron
2. Aluminium
3. Sodium
4. Potassium

Q. The intermixing of particles increases with an increase in temperature.

1. True
2. False

Q. According to Dalton, all matter is made up of small divisible particles called atoms.

1. True
2. False

Q. Question 28
In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer.

Q. Question 29
Calculate the number of neutrons present in the nucleus of an element X which is represented as ${}_{15}^{31}X$

Q.

Who developed modern system of chemical formula notation?

1. Berzilius

2. Dalton

3. Avagadro

4. Lavosier

Q.

why Dalton's atomic theory can not explain the laws of chemical combination?

Q. Magnesium (atomic number 12) will ________ electron to form ________ to attain the nearest noble gas configuration.

1. lose; anion
2. gain; anion
3. lose; cation
4. gain; cation

Q. Which of the following element exhibit variable valency?

1. Iron
2. Aluminium
3. Sodium
4. Potassium

Q. Find the no. of neutrons in an atom if its mass no. is 27 and has 13 electrons in neutral state.

1. 27
2. 13
3. 18
4. 14

Q. In which chemistry concept clearing class we did mole concept??

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. How was the Quantum Mechanical model able to explain the stark and zeeman effect?

Q. In chemistry next chapter is structure of atom??

Q. Physical properties of isotopes are different. Give reasons.​

Q. Gold is represented with the symbol ________.

Q.

________ is the smallest unit of matter that can take part in a chemical reaction.

1. Atom

2. Molecule

3. Compund

4. Element