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1009 available questions

Chemistry · Question 681

Which block contains the greatest number of metallic elements?

  1. s-block
  2. p-block
  3. d-block
  4. f-block
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Correct answer: C

d-block

The d-block is composed of transition metals and contains the largest number of metals among the listed blocks.

Chemistry · Question 682

A period number in the modern periodic table corresponds to the highest occupied:

  1. Atomic number
  2. Atomic mass
  3. Principal quantum number
  4. Azimuthal quantum number
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Correct answer: C

Principal quantum number

The period indicates the highest principal energy level occupied in the ground-state atoms.

Chemistry · Question 683

Which listed periodic-table group consists entirely of metals?

  1. Group 2
  2. Group 1
  3. Group 17
  4. Group 6
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Correct answer: A

Group 2

All Group 2 elements are metals, whereas Group 1 includes non-metallic hydrogen.

Chemistry · Question 684

Which set does not consist entirely of elements from the same group?

  1. C, Si, Ga
  2. Cl, Br, I
  3. N, P, As
  4. He, Ne, Ar
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Correct answer: A

C, Si, Ga

Carbon and silicon are Group 14, whereas gallium is Group 13.

Chemistry · Question 685

An element with atomic number 29 belongs to which period?

  1. Fourth
  2. Fifth
  3. Third
  4. Sixth
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Correct answer: A

Fourth

Atomic number 29 is copper, whose outer occupied shell places it in Period 4.

Chemistry · Question 686

Within a period, the element with the largest atomic volume is generally found in:

  1. Group 1
  2. Group 2
  3. Group 18
  4. Group 12
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Correct answer: A

Group 1

Atomic size is greatest near the left edge of a period, where Group 1 is located.

Chemistry · Question 687

Which ion is not isoelectronic with neon?

  1. F−
  2. O²−
  3. Na+
  4. Ca²+
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Correct answer: D

Ca²+

F−, O²− and Na+ each have 10 electrons; Ca²+ has 18.

Chemistry · Question 688

Among the halogens, the element with the highest first ionization energy is in:

  1. Period 1
  2. Period 2
  3. Period 7
  4. Period 6
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Correct answer: B

Period 2

Fluorine is the Period 2 halogen and has the highest first ionization energy in Group 17.

Chemistry · Question 689

Which listed element has the lowest first ionization energy?

  1. Mg
  2. Rb
  3. Li
  4. Ca
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Correct answer: B

Rb

Rubidium is farthest down and left among the choices, so its valence electron is removed most easily.

Chemistry · Question 690

What is the decreasing order of second ionization energy for K, Ca and Ba?

  1. K > Ca > Ba
  2. Ca > Ba > K
  3. Ba > K > Ca
  4. K > Ba > Ca
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Correct answer: A

K > Ca > Ba

After K loses one electron it has a noble-gas core, making its second ionization energy extremely high; Ca exceeds Ba down Group 2.