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1.

All living and non living things that interact in an area.

2.

How is COVID-19 spread? (more than 1 correct answer - so select 2)

a)

Certain types of food

b)

Coughing and sneezing

c)

Touching contaminated objects

d)

Staying inside too much

3.

List the steps of the scientific method

a)

Conduct experiment

b)

Form a hypothesis

c)

Draw conclusions

d)

Communicate results

e)

Ask a question

f)

Analyze results

1

2

3

4

5

6

1)

2)

3)

4)

5)

6)

4.

What is the atomic number of Potassium?

a)

18

b)

19

c)

20

d)

21

5.

Which of the following elements has an atomic number of 19?

a)

Calcium

b)

Potassium

c)

Sodium

d)

Magnesium

6.

How many protons are present in an atom with an atomic number of 19?

a)

17

b)

18

c)

19

d)

20

7.

What is the mass number of an atom with 19 protons and 20 neutrons?

a)

38

b)

39

c)

40

d)

41

8.

Which element is represented by the symbol 'K' and has an atomic number of 19?

a)

Sodium

b)

Potassium

c)

Calcium

d)

Magnesium

9.

What is the electron configuration of an element with atomic number 19?

a)

$1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$

b)

$1s^2 2s^2 2p^6 3s^2 3p^6 3d^1$

c)

$1s^2 2s^2 2p^6 3s^2 3p^6 4p^1$

d)

$1s^2 2s^2 2p^6 3s^2 3p^6 3d^2$

10.

Which of the following isotopes has 19 protons?

a)

$^{39}_{19}K$

b)

$^{40}_{20}Ca$

c)

$^{23}_{11}Na$

d)

$^{35}_{17}Cl$

11.

What is the charge of a potassium ion (K+) with an atomic number of 19?

a)

+1

b)

-1

c)

+2

d)

-2

12.

Which of the following is a characteristic of an element with atomic number 19?

a)

It is a noble gas

b)

It is a halogen

c)

It is an alkali metal

d)

It is a transition metal

13.

What is the position of an element with atomic number 19 in the periodic table?

a)

Period 3, Group 1

b)

Period 4, Group 1

c)

Period 4, Group 2

d)

Period 3, Group 2

14.

Which of the following reactions involves an element with atomic number 19?

a)

@@ ext{K} + ext{H}_2 ext{O} ightarrow ext{KOH} + ext{H}_2@@

b)

@@ ext{Na} + ext{Cl}_2 ightarrow ext{NaCl}@@

c)

@@ ext{Ca} + ext{O}_2 ightarrow ext{CaO}@@

d)

@@ ext{Mg} + ext{N}_2 ightarrow ext{Mg}_3 ext{N}_2@@

15.

What is the valency of an element with atomic number 19?

a)

1

b)

2

c)

3

d)

4

16.

Which of the following compounds contains an element with atomic number 19?

a)

KCl

b)

NaCl

c)

CaCl2

d)

MgCl2

17.

What is the boiling point of an element with atomic number 19?

a)

63.5°C

b)

75.5°C

c)

100.5°C

d)

150.5°C

18.

Which of the following is a property of an element with atomic number 19?

a)

It is a good conductor of electricity

b)

It is a poor conductor of heat

c)

It is a non-metal

d)

It is a gas at room temperature

19.

What is the melting point of an element with atomic number 19?

a)

63.5°C

b)

75.5°C

c)

100.5°C

d)

150.5°C

20.

Which of the following is a common use of an element with atomic number 19?

a)

Fertilizers

b)

Batteries

c)

Jewelry

d)

Construction

21.

What is the density of an element with atomic number 19?

a)

0.89 g/cm³

b)

1.55 g/cm³

c)

2.33 g/cm³

d)

3.67 g/cm³

22.

Which of the following is a chemical property of an element with atomic number 19?

a)

Reacts vigorously with water

b)

Does not react with acids

c)

Is inert

d)

Forms covalent bonds

23.

What is the standard atomic weight of an element with atomic number 19?

a)

39.0983

b)

40.078

c)

22.9897

d)

35.453

24.

Which of the following is a biological role of an element with atomic number 19?

a)

Essential for nerve function

b)

Component of hemoglobin

c)

Involved in DNA synthesis

d)

Part of bone structure

25.

What is the role of an element with atomic number 19 in plant growth?

a)

Promotes root development

b)

Enhances leaf color

c)

Increases fruit size

d)

Improves disease resistance

19

Total questions: 25

Worksheet time: 25mins

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