What is common about the elements of a period? select all that apply. they have the same number of electron energy levels. they have similar chemical characteristics. they have similar physical characteristics. they transition from a metal to noble gas.

The correct statements are they have the same number of electron energy levels and they transition from a metal to noble gas.

Explanation:

Elements are arranged in 7 periods and 18 groups in a periodic table.

Elements that are arranged in same group have same number of valence electrons and hence show similar chemical properties.

Elements that are arranged in same period have same number of energy levels. In a periods, first metals come, then non-metals and a period ends with a noble gas always.

Hence, the correct statements are they have the same number of electron energy levels and they transition from a metal to noble gas.

hey there!

boiling point is the temperature at which the vapor pressure of the liquid equals atmospheric pressure. the vapor pressure of solvent molecules is decreased when a solute is added, so a higher temperature is required to increase the number of solvent molecules in the gas phase above the liquid.

at the freezing point, the vapor pressures of the solid and liquid are equal; a lower temperature is needed to reduce the number of solvent particles above the liquid.

hope this you

tobey

a) the particles of the chair are strongly held together.