Explanation

• The 100 percent pure gold is 24-carat gold.
• Lower cartages contain less gold 18-carat gold contains 75 percent gold and 25 per cent other metals, often copper or silver.
• Carat is the unit of measurement for the physical weight of diamonds/gold.

Last verified on 02-04-2026

Explanation

• Protons and neutrons form the nucleus of an atom.
• Together, they are called nucleons because they are nuclear particles.

Additional information:

• Nucleons determine the mass of an atom.
• Isotopes are atoms of the same element with different number of neutrons.

Last verified on 07-03-2026

Explanation

A mixture of two or more metals (or a metal with non-metals) is called an alloy

An alloy is made by mixing metals.

It improves strength and durability.

Steel (iron and carbon), is an example of an alloy.

Explanation

Good conductors of electricity:-

gold,

silver,

copper,

aluminum,

and graphite.

***

Bad conductors of electricity:-

plastic,

rubber,

glass,

air,

wood,

charcoal,

and diamond.

ND_16_7_2023

Explanation

Iron is the metal with the highest percentage in stainless steel

Iron (Fe):

The foundational element, providing the main structure, usually 60-75%.

Chromium (Cr):

Essential for rust resistance, forming a protective passive layer, typically 10.5% to 30%.

Nickel (Ni):

Added to enhance ductility, strength, and corrosion resistance, especially in austenitic grades (like 304 stainless steel, which has 8% nickel).

Carbon (C):

A small amount (under 1.2%) is present, influencing hardness and other properties.