19

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

Tags

NGSS.MS-LS2-3

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

• Certain types of food

• Coughing and sneezing

• Touching contaminated objects

• Staying inside too much

List the steps of the scientific method

d

e

f

c

b

a

Ask a question

Communicate results

Conduct experiment

Draw conclusions

Form a hypothesis

Analyze results

What is the atomic number of Potassium?

• 18

• 19

• 20

• 21

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

• Calcium

• Potassium

• Sodium

• Magnesium

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

• 17

• 18

• 19

• 20

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

• 38

• 39

• 40

• 41

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

• Sodium

• Potassium

• Calcium

• Magnesium

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

Tags

NGSS.HS-PS1-1

Which of the following isotopes has 19 protons?