ATOMIC STRUCTURE [dchemlc]

ATOMIC STRUCTURE [dchemlc]

9th Grade

10 Qs

quiz-placeholder

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ATOMIC STRUCTURE [dchemlc]

ATOMIC STRUCTURE [dchemlc]

Assessment

Quiz

Chemistry

9th Grade

Hard

Created by

Miyuni Thisanga De Almeida

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image
which of the following is not a subatomic particle?

nucleus

proton

neutron

electron

Answer explanation

Media Image

Atoms are made of protons, neutrons and electrons. These particles are sometimes called sub-atomic particles because they are smaller than an atom.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

how many protons are there in lead?

82

207

125

164

Answer explanation

Media Image

The number of protons in an atom's nucleus is called its atomic number or proton number.

atomic number = number of protons

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

how many neutrons are there in Radon?

136

86

222

156

Answer explanation

Media Image

The mass number counts the total number of protons and neutrons in the nucleus of the atom:

mass number = number of protons + number of neutrons

therefore;

number of neutrons = mass number - atomic number

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image
Chlorine has two isotopes, chlorine-35 and chlorine-37. what are their atomic numbers respectively?

17 and 17

17 and 19

35 and 37

17 and 35

Answer explanation

Media Image

Isotopes are atoms (of the same element) which have the same atomic number but different mass numbers. They have the same number of protons but different numbers of neutrons.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

how many electrons are there in copper?

29

63

34

92

Answer explanation

Media Image

Atoms are electrically neutral (they have no overall charge). The charge on a proton (+1) is equal but opposite to the charge on an electron (- 1), and therefore in an atom:

number of electrons =

number of protons

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image
what is the electrical charge of an atom?

0

1

-1

2

Answer explanation

Media Image

Atoms are electrically neutral (they have no overall charge). The charge on a proton (+1) is equal but opposite to the charge on an electron (-1)

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image
Chlorine consists of two isotopes, 35CI and 37CI, and a naturally occurring sample contains a mixture of these. Which isotope can be found in more abundance than the other?

35Cl isotope

37Cl isotope

neither of these

Answer explanation

Media Image

we can see that a naturally occurring sample of chlorine must contain more of the 35CI isotope than the 37CI isotope. This is because the relative atomic mass is closer to 35 than to 37.

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