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Use the periodic table to answer the question.

An illustration shows the periodic table of elements. The elements in the periodic table are arranged in groups (columns numbered 1 through 18) and periods (rows numbered 1 through 7) such that the atomic number increases along a period from left to right. The elements are divided into the following categories: · Alkali metals · Alkaline earth metals · Transition metals · Post-transition metals · Lanthanides · Actinides · Metalloids · Nonmetals · Noble gases · Unknown The elements are also classified on the basis of their physical states as follows: · Solid · Liquid · Gas · Unknown The element sulfur is enlarged with the following properties. · Chemical symbol: S · Name: Sulfur · Atomic Number: 16 · Atomic mass: 32.06 · Common oxidation states: 6, 4, 2, negative 2 · Electronegativity: 2.58 · Ionization energies: 999.589 · Electron configuration: [Ne] 3s2 3p4



Which pair of elements has atoms with the same number of valence electrons?

(1 point)
Responses

silicon (Si) and germanium (Ge)
silicon (Si) and germanium (Ge)

potassium (K) and bromine (Br)
potassium (K) and bromine (Br)

indium (In) and lead (Pb)
indium (In) and lead (Pb)

astatine (At) and radon (Rn)

1 answer

To determine which pair of elements has atoms with the same number of valence electrons, we need to look at their positions on the periodic table.

  1. Silicon (Si) and Germanium (Ge):

    • Silicon (Si) is in Group 14 (4A) and has 4 valence electrons.
    • Germanium (Ge) is also in Group 14 and has 4 valence electrons.

  2. Potassium (K) and Bromine (Br):

    • Potassium (K) is in Group 1 (1A) and has 1 valence electron.
    • Bromine (Br) is in Group 17 (7A) and has 7 valence electrons.

  3. Indium (In) and Lead (Pb):

    • Indium (In) is in Group 13 (3A) and has 3 valence electrons.
    • Lead (Pb) is in Group 14 (4A) and has 4 valence electrons.

  4. Astatine (At) and Radon (Rn):

    • Astatine (At) is in Group 17 (7A) and has 7 valence electrons.
    • Radon (Rn) is in Group 18 (8A) and has 8 valence electrons.

The only pair that has the same number of valence electrons is silicon (Si) and germanium (Ge), both with 4 valence electrons. Thus, the correct response is:

silicon (Si) and germanium (Ge).