Q: Which of the following atoms or ions has the greatest number of neutrons?

$$\mathrm{I^-}$$ \text{ with mass number } 127$

Question 1

A neutral atom of chlorine ($$\mathrm{Cl}) $$has an atomic number of 17 and a mass number of 35. How many protons, neutrons, and electrons does it contain?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 2

An atom of tungsten ($$\mathrm{W}) $$has 74 protons and 72 electrons. What is its charge, and is it a cation, anion, or neutral?

Accepted Answer

Charge: $$+2$$, cation

Question 3

Which of the following correctly describes the relationship between atomic number ($$Z$$), mass number ($$A$$), and the number of neutrons ($$N) in an $$atom?

Accepted Answer

$$N = A - Z$$

Question 4

A sulfur atom ($$\mathrm{S}) $$has 16 protons, 17 neutrons, and 16 electrons. What is its atomic number, mass number, and charge?

Accepted Answer

Atomic number: 16, Mass number: 33, Charge: 0

Question 5

Which of the following atoms or ions has exactly 36 electrons?

Accepted Answer

$$\mathrm{Br^-}$$

Question 6

If an atom has 33 protons, 40 neutrons, and 36 electrons, what is its atomic symbol and charge?

Accepted Answer

$$\mathrm{As$$^{3-}$$}$$

Question 7

Which of the following is a correct chemical symbol for an atom with 53 protons, 74 neutrons, and 54 electrons?

Accepted Answer

$$\mathrm{I^-}$$

Question 8

A neutral atom of calcium ($$\mathrm{Ca}) $$has an atomic number of 20. If it loses two electrons, what is its resulting charge and chemical symbol?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 9

Which of the following ions is isoelectronic with argon ($$\mathrm{Ar}$$)?

Accepted Answer

$$\mathrm{Cl^-}$$

Question 10

A sample contains 10 protons, 10 neutrons, and 10 electrons. What is the atomic symbol and charge of this atom?

Accepted Answer

$$\mathrm{Ne}$$, charge $$0$$

Question 11

Which of the following atoms or ions has the greatest number of neutrons?

Accepted Answer

$$\mathrm{I^-}$$ 	ext{ with mass number } 127$

Question 12

Which of the following statements about ions is correct?

Accepted Answer

An anion has more electrons than protons.

Question 13

A patient is found to have a high concentration of $$\mathrm{K^+}$$ ions in their blood. What does the $$+$$ sign indicate about the potassium ion?

Accepted Answer

It has lost one electron compared to the neutral atom.

Question 14

Which of the following elements is most likely to form a $$2^-$$ anion?

Accepted Answer

Sulfur ($$\mathrm{S})$$

Question 15

A neutral atom of bromine ($$\mathrm{Br}) $$has 35 protons. If it gains one electron, what is its new charge and chemical symbol?

Accepted Answer

$$\mathrm{Br^-}$$, charge $$-1$$

Question 16

Which of the following atoms or ions has 53 protons, 74 neutrons, and 54 electrons?

Accepted Answer

$$\mathrm{I^-}$$

Question 17

A sample contains 7 protons, 8 neutrons, and 10 electrons. What is the atomic symbol and charge of this atom or ion?

Accepted Answer

$$\mathrm{N$$^{3-}$$}$$

Question 18

Which of the following ions is isoelectronic with krypton ($$\mathrm{Kr}$$)?

Accepted Answer

$$\mathrm{Br^-}$$

Question 19

A neutral atom of magnesium ($$\mathrm{Mg}) $$has 12 protons and 12 electrons. If it loses two electrons, what is its resulting charge and chemical symbol?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$

Question 20

Which of the following ions has the same number of electrons as a neutral atom of neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{F^-}$$

Atoms, Ions, and the Periodic Table: Study Notes

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