Protons Neutrons

How many protons are in Chlorine?

• 35

• 18

• 17

• 52

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EX.8.P.1.1

How many neutrons does beryllium have?

• 4

• 5

• 9

• 13

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NGSS.MS-PS1-1

Calculate the number of protons, neutrons, and electrons in an isotope of oxygen with a mass number of 17.

• 8 protons, 9 neutrons, 8 electrons

• 8 protons, 8 neutrons, 9 electrons

• 9 protons, 8 neutrons, 8 electrons

• 8 protons, 9 neutrons, 9 electrons

Answer explanation

Oxygen has 8 protons (atomic number 8). For the isotope with a mass number of 17, the number of neutrons is 17 - 8 = 9. Since it's neutral, it has 8 electrons. Thus, the correct choice is 8 protons, 9 neutrons, 8 electrons.

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DOK Level 3: Strategic Thinking

Calculate the number of protons, neutrons, and electrons in an isotope of carbon with a mass number of 14.

• 6 protons, 8 neutrons, 6 electrons

• 6 protons, 6 neutrons, 8 electrons

• 8 protons, 6 neutrons, 6 electrons

• 6 protons, 8 neutrons, 8 electrons

Answer explanation

Carbon has 6 protons (atomic number 6). The mass number is 14, so the number of neutrons is 14 - 6 = 8. In a neutral atom, the number of electrons equals the number of protons, which is 6. Thus, the correct choice is 6 protons, 8 neutrons, 6 electrons.

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DOK Level 3: Strategic Thinking

Given an atom with 15 protons and 16 neutrons, determine its atomic number and mass number.

• Atomic number 15, mass number 31

• Atomic number 16, mass number 31

• Atomic number 15, mass number 16

• Atomic number 31, mass number 15

Answer explanation

The atomic number is determined by the number of protons, which is 15. The mass number is the sum of protons and neutrons: 15 protons + 16 neutrons = 31. Therefore, the correct choice is atomic number 15, mass number 31.

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DOK Level 3: Strategic Thinking

An isotope of an element has 79 protons and 118 neutrons. What is the mass number of this isotope?

• 118

• 197

• 79

• 197

Answer explanation

The mass number of an isotope is the sum of protons and neutrons. Here, 79 protons + 118 neutrons = 197. Therefore, the mass number of this isotope is 197.

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DOK Level 3: Strategic Thinking

If an atom has an atomic number of 6 and a mass number of 14, how many neutrons does it have?

• 6

• 8

• 14

• 20

Answer explanation

To find the number of neutrons, subtract the atomic number from the mass number. Here, mass number (14) - atomic number (6) = 8 neutrons. Therefore, the correct answer is 8.

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DOK Level 3: Strategic Thinking

If an atom has 3 protons, 4 neutrons, and 3 electrons, what is its atomic number and mass number?

• Atomic number 3, mass number 7

• Atomic number 4, mass number 7

• Atomic number 3, mass number 6

• Atomic number 7, mass number 3

Answer explanation

The atomic number is determined by the number of protons, which is 3. The mass number is the sum of protons and neutrons, 3 + 4 = 7. Therefore, the correct choice is atomic number 3, mass number 7.

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DOK Level 3: Strategic Thinking

A certain ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of this ion?

• +3

• -3

• +1

• -1

Answer explanation

The ion has 13 protons and 10 electrons. The charge is calculated as protons (13) - electrons (10) = +3. Therefore, the charge of the ion is +3.

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DOK Level 3: Strategic Thinking

Consider an atom with an atomic number of 15 and a mass number of 31. How many neutrons does this atom have?

• 15

• 16

• 31

• 46

Answer explanation

To find the number of neutrons, subtract the atomic number from the mass number. Here, 31 (mass number) - 15 (atomic number) = 16 neutrons. Therefore, the correct answer is 16.

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DOK Level 3: Strategic Thinking