Question

Use the periodic table to choose the element that matches each description. halogen: group IIA: nonreactive: alkali metal:

Answer 1

The grouping of elements, mostly based on the relative atomic mass

Further explanation

The periodic system of elements is an arrangement of elements classified based on similar properties and their atomic number order.

The periodic system is divided into groups (vertical order) and periods (horizontal order)

• Halogen:

Halogen is a chemical element in group 7A consisting of fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatin (At)

• group IIA:

This group is also known as alkaline earth metal. The elements in this group are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

•  nonreactive:

for metals, in one group, the more reactive the more downward

for non-metallic elements, in one group, the more down the less reactive

• alkali metal:

alkali metals belong to group IA

the elements in group 1A: lithium (Li), sodium (Na), potassium (K) rubidium (Rb), cesium (Cs), and francium (Fr)

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Keywords: The periodic system of elements, atomic numbers, groups, periods

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Answer 2

Halogen,  group IIA, nonreactive, and alkali metal are found in 17th, 2nd, 18th, and 1st column respectively.

Periodic Table:

The elements are arranged according to their atomic number. The elements with similar properties are arranged in groups.

Halogen:

• It is the 17th column of element.
• There octate is not complete. they lake 1 electron.

Group 2A:

• It is the 2nd column also known as alkaline earth metal.
• Their oxidation number is +2.

Nonreactive:

• It is the 18th column of elements.
• There octate is complete.
• Hence they do not usually react.

Alkali metal:

• 1st column from the left in the periodic table (except for Hydrogen).
• This group is also called Group 1 or Group IA.
• They are reactive and often form salts.

Hence we can conclude that halogen,  group IIA, nonreactive, and alkali metal are found in 17th, 2nd, 18th, and 1st column respectively.

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