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Te Whakapapa o te Ngota: Understanding Atoms

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Te Whakapapa o te Ngota: Understanding Atoms

Use the particle facts and isotope data on this sheet, then complete the questions. No other resource is needed.

Read the isotope data

Atomic number tells you the number of protons. In a neutral atom, electrons equal protons. Mass number is the total number of protons and neutrons. Protons have a positive charge, electrons have a negative charge, and neutrons have no charge. Protons and neutrons are in the nucleus; electrons are found in regions or shells around the nucleus.

Atom

Symbol

Atomic number

Mass number

Carbon-12

¹²₆C

Carbon-14

¹⁴₆C

Oxygen-16

¹⁶₈O

Build your atomic understanding

Use evidence from the particle facts and data table. Show calculations where useful.

1.Which particle has a positive charge, which has a negative charge, and which has no charge?

2.Name the part of the atom that contains protons and neutrons. Where are the electrons found?

3.A carbon atom has six protons and six electrons. Explain why this atom has no overall electric charge.

4.Use the table. How many neutrons are in one carbon-12 atom? Show the subtraction you use.

5.A neutral oxygen-16 atom has atomic number 8 and mass number 16. State its number of protons, neutrons and electrons.

6.Carbon-12 and carbon-14 are isotopes of the same element. What is the same in their atoms, and what is different?

7.A neutral atom has 11 protons and 12 neutrons. Work out its number of electrons and its mass number.

8.A sodium atom has 11 protons and 11 electrons. It loses one electron. What is its new charge, and how many electrons does it have now?

9.An atom becomes a different element when its number of neutrons changes. Choose true or false and correct the statement if needed.

TrueFalse

10.A student says, “Carbon-12 and carbon-14 must be different elements because their mass numbers differ.” Write a short correction using the meanings of atomic number and mass number.

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Te Whakapapa o te Ngota: Understanding Atoms

Te Whakapapa o te Ngota: Understanding Atoms

Read the isotope data

Build your atomic understanding

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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