Q: The valence electrons of magnesium is different in ........... quantum number.

The configuration of magnesium is \$1s^2\ 2s^2\ 2p^6\ 3s^2\$.The outermost electron is in s orbital and is paired.Therefore, for the two electrons in 3s orbital, only s, spin quantum number is different.

Q: Bohr Magneton value in S.I. Units is:

1 Bohr Magneton = \$9.273\times 10^{-24} JT^{-1}\$

Question 1

The atomic weight of an atom is because of

Accepted Answer

Atomic weight depends upon mass number, which is equal to sum of, number of protons and neutrons.

Question 2

The valence electrons of magnesium is different in ........... quantum number.

Accepted Answer

The configuration of magnesium is $1s^2\ 2s^2\ 2p^6\ 3s^2$.The outermost electron is in s orbital and is paired.Therefore, for the two electrons in 3s orbital, only s, spin quantum number is different.

Question 3

According to Aufbau principle, the electron has a tendency to occupy that sub-shell which has:

Accepted Answer

The Aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels (e.g., 1s before 2s). In this way, the electrons of an atom or ion form the most stable electron configuration possible.

Question 4

Which of the following quantities can only be a whole number?

Accepted Answer

Atomic number of an element = number of protons = number of electrons and is always a whole number.

Question 5

For an atom of a given element, the number of electrons equals to:

Accepted Answer

For an atom of a given element, the number of electrons are equal to the number of protons which is equal to atomic number of the element.

Question 6

According to Bohr hypothesis, discrete quantity is

Accepted Answer

Bohr's hypothesis:1) Electrons revolves round the nucleus in water orbits.2) Orbit of the electron around the nucleus can take only some special values of radius.3) The energy of the atom as a definite value in these orbits.4) In this Orbits, Angular momentum (e) of the electron is integral multiple of the plank's constant h divided by $2n$ i.e. $l = n \dfrac{h}{2n}$.

Question 7

Bohr Magneton value in S.I. Units is:

Accepted Answer

1 Bohr Magneton = $9.273\times 10^{-24} JT^{-1}$

Question 8

Bohrs atomic model assumes :

Accepted Answer

Bohr's Assumption :( i )  Electron in atoms orbit the nucleus.( ii ) Electron in a quantized orbit will not radiate energy.( iii ) Electrons can only gain and lose energy by jumping from one allowed orbit to other. He also assumed one of the postulates of Rutherford's atomic model, that is, the mass of the nucleus is very large compared to that of the electrons and hence assumed to be infinite

Question 9

The first model of an atom was given by _____________.

Accepted Answer

Sir J.J Thomson gave the first model of atom.He by means of cathode-ray experiment discovered the existence of negatively charged particles in an atom which led to the discovery of electrons. He gave the plum-pudding model of an atom in which electrons are embedded in atom-like currants. Positive electrons are distributed all over the atom.Hence, option (D) is correct.

Question 10

The electrons are filled in various sub levels according to the order of their energies, is known as:

Accepted Answer

The order of filling of orbitals from lower energy to higher energy is explained by the Aufbau's principle and the $n+l$ rule.

Structure Of Atom

Chemistry
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The atomic weight of an atom is because of

The valence electrons of magnesium is different in ........... quantum number.

According to Aufbau principle, the electron has a tendency to occupy that sub-shell which has:

Which of the following quantities can only be a whole number?

For an atom of a given element, the number of electrons equals to:

According to Bohr hypothesis, discrete quantity is

Bohr Magneton value in S.I. Units is:

Bohrs atomic model assumes :

The first model of an atom was given by _____________.

The electrons are filled in various sub levels according to the order of their energies, is known as:

Structure Of Atom

Chemistry 9527 Views

The atomic weight of an atom is because of

The valence electrons of magnesium is different in ........... quantum number.

According to Aufbau principle, the electron has a tendency to occupy that sub-shell which has:

Which of the following quantities can only be a whole number?

For an atom of a given element, the number of electrons equals to:

According to Bohr hypothesis, discrete quantity is

Bohr Magneton value in S.I. Units is:

Bohrs atomic model assumes :

The first model of an atom was given by _____________.

The electrons are filled in various sub levels according to the order of their energies, is known as:

Chemistry
9527 Views