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131.

Which element is found at the top-left corner of the periodic table?

Helium

Hydrogen

Beryllium

Lithium

Explanation Comments

Answer: Hydrogen

Explanation:

Hydrogen is the element found at the top-left corner of the periodic table, in the first row of the first period.

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132.

What is the term for the vertical columns on the periodic table?

Rows

Blocks

Periods

Groups

Explanation Comments

Answer: Groups

Explanation:

The vertical columns on the periodic table are called "groups" or "families." Elements in the same group have similar chemical properties.

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133.

Which noble gas is known for its use in lighting and advertising signs due to its bright red-orange glow when ionized?

Argon

Krypton

Neon

Xenon

Explanation Comments

Answer: Neon

Explanation:

Neon is commonly used in lighting and advertising signs due to its distinctive red-orange glow when ionized.

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134.

In the periodic table, what is the name of the row that contains the alkali metals?

Period 3

Period 4

Period 1

Period 2

Explanation Comments

Answer: Period 2

Explanation:

The alkali metals are found in Period 2 of the periodic table.

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135.

Which element is known as the "noble gas" due to its tendency to not react with other elements?

Krypton

Neon

Argon

Helium

Explanation Comments

Answer: Helium

Explanation:

Helium is often referred to as a "noble gas" because it is extremely stable and does not readily react with other elements.

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136.

Which group of elements on the periodic table is known as the "halogens"?

Group 8

Group 7

Group 2

Group 1

Explanation Comments

Answer: Group 7

Explanation:

Group 7 elements are known as the "halogens" and include elements like fluorine, chlorine, and iodine.

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137.

Which element is the most abundant gas in Earth's atmosphere?

Oxygen

Nitrogen

Carbon dioxide

Argon

Explanation Comments

Answer: Nitrogen

Explanation:

Nitrogen is the most abundant gas in Earth's atmosphere, making up approximately 78% of the air we breathe.

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138.

What is the term for elements in the "f-block" of the periodic table, often placed at the bottom?

Lanthanides

Alkaline earth metals

Actinides

Transition metals

Explanation Comments

Answer: Actinides

Explanation:

The elements in the "f-block" at the bottom of the periodic table include the lanthanides and actinides. The actinides are known for their radioactive properties.

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139.

Which element is located in Group 17 and Period 3 of the periodic table, and is commonly used as a disinfectant in water treatment?

Iodine

Chlorine

Fluorine

Bromine

Explanation Comments

Answer: Chlorine

Explanation:

Chlorine, found in Group 17 and Period 3, is often used as a disinfectant in water treatment due to its strong oxidizing properties.

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140.

Which element is the only non-metal in Group 1 of the periodic table?

Lithium

Potassium

Sodium

Hydrogen

Explanation Comments

Answer: Hydrogen

Explanation:

Hydrogen is the only non-metal in Group 1, often referred to as the alkali metals group.

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