Explanation

Hydrogen is the most abundant element in the universe.

it is about 75 percent of its normal matter and was created in the Big Bang.

Additional information:

Oxygen is the most abundant element in the earth`s crust.

Calcium is the most abundant mineral in the human body.

Explanation

Most abundant element in Earth crust is Oxygen.

Oxygen in the crust is (46.1%).

The chemical formula of oxygen (dioxygen) is O2.

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List of 10 Most Abundant Elements in the Earth's Crust

Explanation

The hardest substance in the world is diamond.

Its hardness is due to the strong covalent bonding between its carbon atoms.

This making it the most resistant to scratching.

Category: Native minerals

Cleavage: 111 (perfect in four directions)

Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)

Crystal habit: Octahedral

Crystal system: Cubic

Dana classification: 1.3.6.1

Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Explanation

Dry ice is a solid form of carbon dioxide.

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"Dry ice" is solid, frozen carbon dioxide, which is sublimated at a chilly -78.5 °C (-109.3°F).

Dry ice is used primarily as a cooling agent.

Dry ice does not melt into a liquid when heated instead, it changes directly into a gas.

ND16-8-2023

Explanation

Water has maximum density at 4°C.

When Water is in its Solid form (Ice) below 0°C.

Explanation

• Humidity in the air was measured by a Hygrometer.
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• A hygrometer is an instrument used to measure relative humidity.
• Humidity is the measure of the amount of moisture in the air.
• A psychrometer is an example of a hygrometer.
• hygrometer.
  
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• The humidity in the air tells us about the ratio of Water vapors in the air

Explanation

Aluminum is the most abundant metal in the Earth's crust.

It comprising about 8% of its weight.

It is primarily found in the form of bauxite ore.

Explanation

Graphite is a crystalline form of the element carbon.

It consists of stacked layers of graphene.

Graphite occurs naturally and is the most stable form of carbon under standard conditions.

Explanation

Explanation

Mercury is the only metal that is liquid at normal temperatures. 

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Chemical compounds of mercury have found uses in batteries, in biocides in the paper industry, in paints, and on seed grain, as antiseptics in pharmaceuticals, as reagents in laboratories, and as catalysts.

Four other elements are liquids slightly warmer than room temperature.

They are:

• francium
• cesium
• gallium
•  rubidium

ND31-12-2022

SH10-8-2023