atom question

Question 1 - Question: What is an electron? State its relative mass and charge. Answer: The electron is a negatively charged particle found in the atoms of all the elements. Its relative mass is 1/1840 a.m.u and relative charge is ..

Atom was derived from the Greek word 'atoms', meaning 'indivisible'. Thus, it was considered to be indivisible.Atoms of the same element are identical in shape, size, mass and other properties.Atoms cannot be created, divided or destroyed during any che..

Atomicity is the number of atoms of an element present in one molecule of that element. They can be monoatomic (He), diatomic (H 2 ), triatomic (O 3 ) and polyatomic (S 8 ..

Hydrogen is diatomic (H 2 ) whereas alkali metals are monoatomi..

A hydrogen atom has a mass of 1.67 × 10 -27 kilogram. Express the mass of 4 × 10 2 hydrogen atoms in scientific notation. => 6.68 x 10 -25 kilogram or 6.68 x 10 29 kilogram or 6.68 x 10 -29 kilogram or 6.68 x 10 25 kilogram..

The radius of a Hydrogen atom is equal to 1 × 10 -1 angstrom. Write this number in standard form. => 0.01 or 0.001 or 0.0001 or 0.1..

The diameter of an atom is 0.0000000125 cm. Which one of the following shows this number in scientific notation? => 1.25 × 10 - 8 cm or 1.25 × 10 - 10 cm or 12.5 × 10 - 8 cm or 125 × 10 - 8 cm..

The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom..

The nuclei of atoms is made up of protons and neutrons. These two components of the nucleus are referred to as nucleons. The electrons occupy the space outside the nucleus. Since an atom is electrically neutral, the number of protons in the nucleus is exactly equal to the number..

The distance from the centre of the nucleus to the outermost shell of an atom is called the atomic radius of that atom (Fig. 2.1..