Atoms

Smallest unit of matter

• atom

• cell

• nucleus

• proton

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What are the atomic particles located inside the nucleus of an atom?

• protons and electrons

• protons and neutrons

• electrons and neutrons

• neutrons and nucleus

Atomic number is also the number of _________.

• electrons

• neutrons

• protons

• neutons

The positively charged particles of an atom.

• electrons

• protons

• neutrons

• nucleus

If an element has equal number of electrons and protons, the atom is electrically _______.

• positively charged

• negatively charged

• an isotope

• neutral

Atomic mass is the sum of the number of _________ and ________.

• protons, electrons

• protons, neutrons

• electrons, neutrons

• neutrons and nucleus

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NGSS.MS-PS1-1

The number of __________ determines the name of the element in the periodic table.

• neutrons

• electrons

• energy level

• protons

Are carbon and oxygen atoms the same? Explain your answers based on the atomic theory.

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Based on the passage, how would you describe an element and an atom?

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Atomic Theory​ (a)  

• Ernest Rutherford
• J.J Thomson
• John Dalton

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