Structure of Atom Test

Result

Structure of Atom Test - 25

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The $$d_{z^{2}}$$ orbital can give room only to:

A
$$10$$ electrons

B
$$6$$ electrons

C
$$2 $$ electrons

D
$$4$$ electrons

Solution

Any orbital can give room only to 2 electrons (maximum)
Question 2
1 / -0

After completion of ‘$$np$$’ level, the electron enters into which level according to $$(n+p)$$ rule?

A
$$(n - 1)d$$

B
$$(n + 1)s$$

C
$$nd$$

D
$$(n + 1)p$$

Solution

Energy of nd level would be higher than $$(n+1)s$$.
$$nd=n+2$$, $$(n+1)s=n+1$$.
So, electron will enter into lower energy level.
i.e, $$(n+1)s$$
Let us take an example of $$'4p'$$ orbital. As per Moeller diagram, the orbital that will be filled after $$'4p'$$ orbital is $$'5s'$$. Hence, $$(n+1)s$$ orbital will be filled after $$'np'$$ orbital.
Question 3
1 / -0

Which of the following properties are similar for isotopes?

A
Physical properties

B
Chemical properties

C
Both physical and chemical properties

D
Neither physical nor chemical properties

Solution

Isotopes have same atomic numbers but different mass numbers. This also means that the isotopes have the same number of electrons.
Chemical properties are determined by electronic configuration. So, with the same electronic configuration, they have similar chemical properties.
Question 4
1 / -0

To which of the following is Bohr's theory applicable:
I) $$He^{+}$$
II) $$Li^{2+}$$
III) Tritium
IV) $$Be^{2+}$$
The correct combination is:

A
III, IV

B
I, II, III, IV

C
I, II

D
I, II, III

Solution

Bohr's atomic model explains the spectra of single-electron atoms like $$H$$-atom. It does not explain the spectra of multi-electron atoms.

So the atoms which are isoelectronic and have the same electronic configuration are well explained by this atomic model.

$$He^+$$, $$Li^{2+}$$ and tritium $$_{ 1 }{ H }^{ 3 }$$ have same number of electrons as that of hydrogen atom i.e. $$1$$ while $$Be^{2+}$$ is formed by losing $$2e$$. So, it is a two-electron system.

Option D is correct.
Question 5
1 / -0

Which of the following energy state is filled by an electron after the completion of $$4p$$ orbital?

A
$$5s$$

B
$$3d$$

C
$$4d$$

D
$$4f$$

Solution

When $$4p$$ orbital in any atom are filled completely, the next electron goes in $$5s(n+l=5+0=5)$$ not in $$4d(n+l=4+2=6)$$,electron first enters into the subshell which is having less $$(n+l)$$ value (energy). Hence the $$5s$$ is filled first than $$4d$$.
Question 6
1 / -0

The atomic number at which filling of a g-orbital is likely to begin is:

A
$$121$$

B
$$116$$

C
$$106$$

D
$$124$$

Solution

The above question can be answered on the basis of reasoning from analogy. We note that two periods have to pass before d-orbitals begin to fill. This is also true of the spot where f-orbitals commence filling. The second row where f-orbitals fill happens to be row #7 (the one starting with Fr). The first element where 5f-orbitals enter in is actinium (Ac, Z = 89). Adding 32 to this would give element #121 termed as Unbiunium, the first Super-Actinide.
Question 7
1 / -0

The best evidence that electrons are arranged in definite orbits or energy levels is based on the observation that:

A
atomic spectra consist of discrete lines and not continuous bands

B
electrons in the beta ray have high kinetic energy

C
the penetrating power of cathode ray electrons depends upon the voltage used to produce them

D
electrons revolve around the nucleus

Solution

The best evidence that electrons are arranged in definite orbits or energy levels is based on the observation that the spectral lines of hydrogen atom consist of discrete lines and not continuous bands.
Question 8
1 / -0

The band spectrum is caused by:

A
molecules

B
atoms

C
any substance in solid state

D
any substance in liquid state

Solution

Hint: Band spectrum arises because of electron transition between the valence band and conduction band.

Explanation:
The band spectrum is caused by molecules. The energy levels of molecules are so close to each other that they combine to form a band. The valence band and conduction band are two types of bands. Electron transition between these two bands forms band spectrum.

For example a spectrum of air. The bright bands are due to molecular oxygen (O2), molecular nitrogen (N2), and other molecules

So from the above example, it is clear that Option A is the answer.
Question 9
1 / -0

In the lowest energy level of hydrogen atom, electron has an angular momentum equal to:

A
$$\dfrac{\pi }{h}$$

B
$$\dfrac{h}{\pi }$$

C
$$\dfrac{h}{2\pi }$$

D
$$\dfrac{2\pi }{h}$$

Solution

The angular momentum$$ L$$ $$=m_{e}vr$$ is on integer multiple of $$\dfrac{h}{2\pi }$$

$$mvr=\dfrac{nh}{2\pi}$$

For, $$n=1$$

$$mvr=\dfrac{h}{2\pi}$$
Question 10
1 / -0

In potassium, the order of energy levels is:

A
3s > 3d

B
4s < 3d

C
4s > 4p

D
4s = 3d

Solution

The "4s" orbital is having lower energy than "3d" orbital.

The (n+l) value of "4s" orbital is lower than that of "3d" orbital.

Option B is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 25

Result

Structure of Atom Test - 25

Score

-

Rank

-

SHARING IS CARING

Question 1

$$10$$ electrons

$$6$$ electrons

$$2 $$ electrons

$$4$$ electrons

Solution

Question 2

$$(n - 1)d$$

$$(n + 1)s$$

$$nd$$

$$(n + 1)p$$

Solution

Question 3

Physical properties

Chemical properties

Both physical and chemical properties

Neither physical nor chemical properties

Solution

Question 4

III, IV

I, II, III, IV

I, II

I, II, III

Solution

Question 5

$$5s$$

$$3d$$

$$4d$$

$$4f$$

Solution

Question 6

$$121$$

$$116$$

$$106$$

$$124$$

Solution

Question 7

atomic spectra consist of discrete lines and not continuous bands

electrons in the beta ray have high kinetic energy

the penetrating power of cathode ray electrons depends upon the voltage used to produce them

electrons revolve around the nucleus

Solution

Question 8

molecules

atoms

any substance in solid state

any substance in liquid state

Solution

Question 9

$$\dfrac{\pi }{h}$$

$$\dfrac{h}{\pi }$$

$$\dfrac{h}{2\pi }$$

$$\dfrac{2\pi }{h}$$

Solution

Question 10

3s > 3d

4s < 3d

4s > 4p

4s = 3d

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.