Structure of Atom Test

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Structure of Atom Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Thomson's atomic model suggested that the atom is:

A
not divisible

B
divisible

C
electrons revolve around nucleus

D
both A and C

Solution

Dalton's atomic theory suggested that all matter is made of indivisible atoms.

Thomson proposed a model of the atom which is also known as the plum pudding model. It suggested that the atom is divisible. It became clear as he proposed that the electrons are embedded in the positively charged sphere of an atom.
The concept of electrons revolving around the nucleus came only with Rutherford's model.
So. option B is correct.
Question 2
1 / -0

Which property of atom was explained in Thomson's model?

A
Charge

B
Nuetrons

C
Stability

D
Nuetrality
Question 3
1 / -0

How many orbitals are there in the second principal energy level, n = 2, of an atom?

A
$$1$$

B
$$9$$

C
$$4$$

D
$$16$$

Solution

There are four orbitals in the second principal energy level, n = 2, of an atom. These include one 2s orbital and three 2p orbitals. Three 2p orbitals include $$2p_x$$, $$2p_y$$ and $$2p_z$$ orbitals.
Question 4
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Which of the following has a mass of 1 and an atomic number of 1?

A
Proton

B
Gamma ray

C
Neutron

D
Alpha particle

E
Beta particle

Solution

Proton has a mass of 1 and an atomic number of 1.
Question 5
1 / -0

X is defined by the number of protons. What is X?

A
Cation

B
Inert Gas

C
Crystal

D
Anion

E
Element

Solution

A chemical element or element is a species of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, Z).
Question 6
1 / -0

Which element has a mass number of 20 and contains 11 neutrons?

A
Copper

B
Gallium

C
Calcium

D
Sodium

E
Fluorine

Solution

Mass number (A) = Number of protons + Number of neutron
$$\therefore$$ Number of proton = Mass number - Number of neutron
$$\therefore$$ Number of proton = $$20-11=9$$

So, here the number of protons is 9.
Fluorine contains 9 protons.

Thus, option D is correct.
Question 7
1 / -0

What happens when both of the orbitals in a molecule are in phase, either both positive or both negative and the electrons in the bonds are at their lowest energy level?

A
Bonding takes place.

B
The chemicals don't react.

C
The atoms don't bond.

D
Bonding doesn't take place.

E
The electrons in the atoms don't share orbitals.

Solution

When both of the orbitals in a molecule are in phase, either both positive or both negative, and the electrons in the bonds are at their lowest energy level, bonding takes place. The electron density between two nuclei increases and in other places, the electron density decreases.
Question 8
1 / -0

Which of the following contains up to $$10$$ electrons.

A
$$1s$$

B
$$2s$$

C
$$3s$$

D
$$3p$$

E
$$3d$$

Solution

1s orbital contains upto 2 electrons.
2s orbital contains upto 2 electrons.
3s orbital contains upto 2 electrons.
3p orbital contains upto 6 electrons.
3d orbital contains upto 10 electrons.
Note: s, p, d and f orbitals contain 1, 3, 5 and 7 sub energy levels. Each sub energy level can contain upto 2 electrons.
Question 9
1 / -0

Which one contains up to ten electrons from the following?

A
$$1s$$

B
$$2s$$

C
$$3s$$

D
$$3p$$

E
$$3d$$

Solution

3d orbital contains up to ten electrons.
1s orbital contains up to two electrons.
2s orbital contains up to two electrons.
3s orbital contains up to two electrons.
3p orbital contains up to six electrons.
Question 10
1 / -0

According to Bohr's model of the atom, atoms emit or absorb radiation only at certain wavelengths.Identify why is it so

A
Because the protons and electrons are distributed evenly throughout the atom

B
Because electrons can orbit the nucleus at any radius

C
Because electrons orbit the nucleus only at certain discrete radii

D
Because protons orbit the nucleus only at certain discrete radii

E
Because photons can only have discrete wavelength

Solution

Bohr's frequency condition is given by $$hc/\lambda=E_{2}-E_{1}$$
Above relation shows that wavelength $$\lambda$$ of radiation depends upon energy difference of two orbits, $$\lambda$$ is certain because energy difference is constant for two orbits it means $$E_{1}$$ and $$E_{2}$$ are also fixed i.e. electron is revolving in some fixed orbits of discrete radii. These orbits are called stationary orbits in which electron does not emit energy when revolving in these orbits.

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 38

Result

Structure of Atom Test - 38

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SHARING IS CARING

Question 1

not divisible

divisible

electrons revolve around nucleus

both A and C

Solution

Question 2

Charge

Nuetrons

Stability

Nuetrality

Question 3

$$1$$

$$9$$

$$4$$

$$16$$

Solution

Question 4

Proton

Gamma ray

Neutron

Alpha particle

Beta particle

Solution

Question 5

Cation

Inert Gas

Crystal

Anion

Element

Solution

Question 6

Copper

Gallium

Calcium

Sodium

Fluorine

Solution

Question 7

Bonding takes place.

The chemicals don't react.

The atoms don't bond.

Bonding doesn't take place.

The electrons in the atoms don't share orbitals.

Solution

Question 8

$$1s$$

$$2s$$

$$3s$$

$$3p$$

$$3d$$

Solution

Question 9

$$1s$$

$$2s$$

$$3s$$

$$3p$$

$$3d$$

Solution

Question 10

Because the protons and electrons are distributed evenly throughout the atom

Because electrons can orbit the nucleus at any radius

Because electrons orbit the nucleus only at certain discrete radii

Because protons orbit the nucleus only at certain discrete radii

Because photons can only have discrete wavelength

Solution

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