Structure of Atom Test

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Structure of Atom Test - 36

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Question 1
1 / -0

How is the number of rings in the Bohr's model of any element determined?

A
Column number on periodic table

B
Atomic mass

C
Row number on periodic table

D
Atomic number

Solution

As per the periodic table, there are seven electron shells which contain the same number of electrons. The orbit is nothing but rings. The number of rings in the Bohr model of an element is determined by row number on the periodic table. It corresponds to principal quantum number n.
Question 2
1 / -0

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

A
Copper

B
Sodium

C
Fluorine

D
Calcium

Solution

Mass no.=no. of proton+no. of neutron
no. of proton=mass no. - no. of neutron
=20- 11
=9
Fluorine has a mass number of 20 and contains 11 neutrons.

Atomic Number of Calcium is 20, hence, mass number has to be much higher. Same is the case with copper. Sodium has an atomic number = 11, but we know that its mass number is 23. Only option left is fluorine.
Question 3
1 / -0

Elements are characterized by the ______ of their atoms.

A
electrons

B
mass

C
protons

D
shape

Solution

An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron.If you change the number of protons an atom has, you change the type of element it is.
Hence, elements are characterized by the protons of their atoms.
Question 4
1 / -0

The ratio between neutrons in C and Si with respect to atomic masses 12 and 28 is _________.

A
2:3

B
3:2

C
3:7

D
7:3

Solution

Carbon,
Atomic Number $$= 6 =$$ Electrons $$= $$ Protons
Neutrons $$= $$ Mass Number $$-$$ Protons$$ = 12 - 6 = 6$$
Silicon,
Atomic Number$$ = 14 = $$Electrons $$= $$ Protons
Neutrons $$ =$$ Mass Number $$-$$ Protons $$= 28 - 14 = 14$$
Ratio $$= 6:14 \ or \ 3:7$$
Question 5
1 / -0

The atomic number of an element is $$21$$ and the number of neutrons in its atom is $$18$$. Find the mass number of the element?

A
$$40$$

B
$$35$$

C
$$39$$

D
$$41$$

Solution

Atomic number or number of protons $$= 21$$
Number of neutrons $$= 18$$
Mass number$$(A)= Number\ of\ protons + Number\ of\ neutrons$$
Mass number$$(A)=21+18$$
Mass number$$(A)=39$$
Question 6
1 / -0

Atomic mass of oxygen is ________.

A
17

B
16

C
18

D
1

Solution

Atomic mass of oxygen is 16.
The average atomic mass of oxygen is 15.9994 atomic mass units. However, this atomic mass is the average atomic mass of all the isotopes in nature. That being said, the most common isotope is the first one. So, when most of us refer to oxygen it is the oxygen with 8 neutrons.
Question 7
1 / -0

The net charge inside an atom is zero because :

A
the magnitude of positive charge is more than negative charge inside atom

B
the magnitude of positive and negative charge is same inside atom

C
the magnitude of positive and negative charge is same outside atom

D
the magnitude of positive charge is less than negative charge inside atom

Solution

Thomson model of an atom is also known as Thomson's plum pudding model. In 1903, J. J. Thomson proposed the structure of an atom similar to that of a Christmas pudding. According to him, the magnitude of positive and negative charge is same inside atom, so net charge inside an atom is zero.
Question 8
1 / -0

In Thomson's model, _________ are embedded in a positively charged 'soup'.

A
electrons

B
neutrons

C
protons

D
ions

Solution

In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged "plums" surrounded by positively charged "pudding" .
Question 9
1 / -0

Which of the following disproved Thomson's model?

A
The nuclear model of an atom

B
The electron model of an atom

C
The atomic model of an atom

D
None of above

Solution

Thomson's student, Ernest Rutherford conducted an experiment using gold foil which disproved Thomson's model. His model became known as the nuclear model of an atom.
Question 10
1 / -0

According to Thomson, an atom consists of:

A
embedded electrons

B
positively charged uniform sphere

C
negatively charged nucleus

D
Both A and B

Solution

According to the Thomson model, an atom consists of a positively charged sphere with electrons embedded in it. An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude.

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Structure of Atom Test - 36

Result

Structure of Atom Test - 36

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SHARING IS CARING

Question 1

Column number on periodic table

Atomic mass

Row number on periodic table

Atomic number

Solution

Question 2

Copper

Sodium

Fluorine

Calcium

Solution

Question 3

electrons

mass

protons

shape

Solution

Question 4

2:3

3:2

3:7

7:3

Solution

Question 5

$$40$$

$$35$$

$$39$$

$$41$$

Solution

Question 6

17

16

18

1

Solution

Question 7

the magnitude of positive charge is more than negative charge inside atom

the magnitude of positive and negative charge is same inside atom

the magnitude of positive and negative charge is same outside atom

the magnitude of positive charge is less than negative charge inside atom

Solution

Question 8

electrons

neutrons

protons

ions

Solution

Question 9

The nuclear model of an atom

The electron model of an atom

The atomic model of an atom

None of above

Solution

Question 10

embedded electrons

positively charged uniform sphere

negatively charged nucleus

Both A and B

Solution

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