Question 1

Which of the following elements is classified as a metalloid?

Accepted Answer

Silicon (Si)

Question 2

Which element is a member of the alkali metal family?

Accepted Answer

Potassium (K)

Question 3

What is the predictable charge of a magnesium ion?

Accepted Answer

$$+2$$

Question 4

Which of the following correctly describes the trend in atomic size across a period from left to right?

Accepted Answer

Atomic size decreases

Question 5

Arrange the following atoms in order of increasing atomic size: Na, Mg, Al.

Accepted Answer

Al \u003c Mg \u003c Na

Question 6

Which of the following ions has the largest ionic radius?

Accepted Answer

$$\mathrm{Cl^-}$$

Question 7

Which of the following pairs are isoelectronic?

Accepted Answer

$$\mathrm{Na^+}$$ \,\&\, \mathrm{Ne}$

Question 8

Arrange the following isoelectronic species in order of increasing radius: $$\mathrm{Na^+}$$, $$\mathrm{Mg$$^{2+}$$}$$, $$\mathrm{Al$$^{3+}$$}.$$

Accepted Answer

$$\mathrm{Al$$^{3+}$$} \u003c \mathrm{Mg$$^{2+}$$} \u003c \mathrm{Na^+}$$

Question 9

Which of the following statements about ionization energy is correct?

Accepted Answer

Ionization energy increases across a period from left to right.

Question 10

Which element has a higher first ionization energy: Oxygen (O) or Nitrogen (N)? Explain the exception.

Accepted Answer

Nitrogen (N), due to its half-filled p subshell stability.

Question 11

Define first ionization energy.

Accepted Answer

The energy required to remove the outermost electron from a neutral atom in the gas phase.

Question 12

Why do successive ionization energies always increase for a given element?

Accepted Answer

Each successive electron is removed from an increasingly positive ion, requiring more energy.

Question 13

Which of the following elements is a noble gas?

Accepted Answer

Neon (Ne)

Question 14

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

Accepted Answer

$$\mathrm{Cl^-}$$

Question 15

Which of the following best explains the trend in atomic size down a group?

Accepted Answer

Atomic size increases due to the addition of electron shells.

Question 16

Which of the following elements forms a $$+1$$ ion with predictable charge?

Accepted Answer

Lithium (Li)

Question 17

Arrange the following atoms by decreasing ionization energy: F, O, N.

Accepted Answer

F \u003e O \u003e N

Question 18

Which of the following is NOT a halogen?

Accepted Answer

Argon (Ar)

Question 19

A patient is found to have high levels of $$\mathrm{Na^+}$$ and $$\mathrm{K^+} in $$their blood. Which family do these ions belong to?

Accepted Answer

Alkali metals

Question 20

Which of the following best describes the term 'isoelectronic'?

Accepted Answer

Species with the same number of electrons

Periodic Trends and Properties of Elements: Study Guide (Chapters 3, 4, 5, 6)

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