Protons

How many protons are in Chlorine?

• 35

• 18

• 17

• 52

Tags

EX.8.P.1.1

What is the atomic number of silicon?

• 14

• 28

• 42

• 7

Tags

NGSS.MS-PS1-1

Which particles are found in the nucleus of an atom?

• protons only

• neutrons only

• protons & electrons

• protons & neutrons

Which charge is POSITIVE?

• Proton

• Neutron

• Electron

• Cell

What does the atomic number of an element represent?

• The number of neutrons

• The number of protons

• The number of electrons

• The total mass of the atom

Calculate the number of protons in a neutral atom of sulfur.

• 14

• 16

• 18

• 20

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DOK Level 2: Skill/Concept

How many protons does this element have?

• 118

• 77

• 78

• 196

Tags

NGSS.MS-PS1-1

If an atom has 4 protons, 5 neutrons, and 4 electrons, what is its atomic number and mass number?

• Atomic number 4, mass number 9

• Atomic number 5, mass number 9

• Atomic number 4, mass number 8

• Atomic number 9, mass number 4

Answer explanation

The atomic number is determined by the number of protons, which is 4. The mass number is the sum of protons and neutrons, 4 + 5 = 9. Therefore, the correct choice is atomic number 4, mass number 9.

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DOK Level 3: Strategic Thinking

Calculate the number of protons, neutrons, and electrons in an isotope of nitrogen with a mass number of 15.

• 7 protons, 8 neutrons, 7 electrons

• 7 protons, 7 neutrons, 8 electrons

• 8 protons, 7 neutrons, 7 electrons

• 7 protons, 8 neutrons, 8 electrons

Answer explanation

Nitrogen has an atomic number of 7, meaning it has 7 protons and 7 electrons. The mass number is 15, so the number of neutrons is 15 - 7 = 8. Thus, the correct choice is 7 protons, 8 neutrons, 7 electrons.

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DOK Level 3: Strategic Thinking

If an atom has 5 protons, 6 neutrons, and 5 electrons, what is its atomic number and mass number?

• Atomic number 5, mass number 11

• Atomic number 6, mass number 11

• Atomic number 5, mass number 10

• Atomic number 11, mass number 5

Answer explanation

The atomic number is determined by the number of protons, which is 5. The mass number is the sum of protons and neutrons, 5 + 6 = 11. Therefore, the correct choice is atomic number 5, mass number 11.

Tags

DOK Level 3: Strategic Thinking