, 22.06.2019 21:00 cici65360

# What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.

I think it's D . They have the same number of electrons in their outermost shells

Answer : The correct option is, (D) They have the same number of electrons in their outermost shells.

Explanation :

Periods : A row in the periodic table is known as periods.

The common features about the elements of a period are :

Each periods has elements with the same number of electron shells or energy levels or shell.

They transition from metal to noble gas that means they move from metal to non-metal and then non-metal to noble gas.

Groups : A column in the periodic table is known as groups.

The common features about the atoms of elements in a same group are :

Each groups has elements with the same number of valance electrons or have same of electrons in their outermost shells.

The elements in the same group have similar chemical properties.

The elements in the same group have similar physical properties.

Hence, the correct option is, (D) They have the same number of electrons in their outermost shells.

Option (D).

Explanation:

The modern periodic table is used to study the physical and chemical properties of each element. The modern periodic table shows periodicity in the elements.

The study of the element can be done down the group and along the period. As we go down the group in the periodic table, the number of valance shell increases by one unit but the number of electron in the outermost shell remains same.

Thus, the correct answer is option (D).

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