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The Periodic Table Online Practice

Complete this assessment to review what you’ve learned. It will not count toward your grade.
4 of 154 of 15 Items

Question
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

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

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

astatine (At) and radon (Rn)
astatine (At) and radon (Rn)

silicon (Si) and germanium (Ge)

1 answer

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

  • Indium (In): Atomic number 49, located in group 13. It has 3 valence electrons.

  • Lead (Pb): Atomic number 82, located in group 14. It has 4 valence electrons.

  • Potassium (K): Atomic number 19, located in group 1. It has 1 valence electron.

  • Bromine (Br): Atomic number 35, located in group 17. It has 7 valence electrons.

  • Astatine (At): Atomic number 85, located in group 17. It has 7 valence electrons.

  • Radon (Rn): Atomic number 86, located in group 18. It has 8 valence electrons.

  • Silicon (Si): Atomic number 14, located in group 14. It has 4 valence electrons.

  • Germanium (Ge): Atomic number 32, located in group 14. It has 4 valence electrons.

From this analysis, we see that the elements silicon (Si) and germanium (Ge) both have 4 valence electrons. Therefore, the correct response is:

silicon (Si) and germanium (Ge).