atomic structure

atomic structure

9th Grade

12 Qs

quiz-placeholder

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atomic structure

atomic structure

Assessment

Quiz

Chemistry

9th Grade

Hard

Created by

Yiki Ng

Used 3+ times

FREE Resource

12 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

1. An atom has an atomic number of 12 and a mass number of 25. The number of electrons in the atom is

12

13

25

37

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

2. The relative atomic mass of an element is

The absolute mass of an atom of the element.

The total mass of protons and neutrons in its nucleus.

The average mass of an atom of the element as it occurs in nature, relative to the 12C = 12.000 00 scale.

The average mass number of different isotopes of the element relative to the 12C = 12.000 00 scale.

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

3. Which of the following statements can explain why noble gases are stable?

They are all gases at room temperature.

They are Group 0 elements.

They have eight electrons in their outermost shells.

They are all elements.

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

4. Which of the following elements is a metal?

Aluminium

Carbon

Germanium

Neon

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

5. Which of the following elements does NOT conduct electricity?

Bromine

Graphite

Magnesium

Gold

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

6. Which of the following elements is a solid at room temperature and pressure?

Cl

N

Ne

S

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

7. An atom has 28 electrons and 30 neutrons. Which of the following combinations about the atom is correct?

Atomic no.: 28 Mass no.: 30

Atomic no.: 28 Mass no.: 58

Atomic no.: 30 Mass no.: 28

Atomic no.: 58 Mass no.: 28

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