Electron arrangement and periodic table

What do the vertical column on the periodic table tell us?

• The number of orbitals

• The number of valence electrons

• atomic mass

• atomic number

What is the name of group number 1?

What group number are the halogens?

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What group and period does this element belong in ?

• period 1 and group 3

• period 2 and group 3

• period 3 and group 1

• group 3 and group 2

How many valence electrons does the potassium atom have?

Noble gases are elements in column 17

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What is the electronic configuration of calcium?

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The periodic table does not reveal the underlying atomic structure of atoms.

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Oxygen atom with atomic number 8 belongs to period

What is the significance of the atomic number in the periodic table?

• It represents the number of valence electrons

• It determines the position of the element in the periodic table

• It indicates the number of orbitals

• It reflects the atomic mass of the element