Are two or more elements that have been chemically combined. mixtures compounds atoms colloids

Option (b) is the correct answer.

Explanation:

When two or more atoms of different elements are chemically combined together in similar composition then the product formed is known as a compound.

For example, NaCl is an ionic compound.

Mixture is the substance in which two or more different components are mixed together in different composition. Components of a mixture never combine chemically.

For example, mud in water is a mixture.

Atom is defined as a single molecule of an element. For example, Na (sodium) atom.

A colloid is defined as a mixture in which insoluble particles are microscopically dispersed and suspended throughout another substance.

For example, milk is a colloid.

Therefore, we can conclude that compounds are two or more elements that have been chemically combined.

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8