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What is the atomic number of hydrogen?
A. 0
B. 1
C. 2
D. 8
Correct Answer Is Option = 1
Notes / Explanation
The atomic number of hydrogen is one, which means that hydrogen is the first and the simplest of all the chemical elements. In chemistry, each element is given an atomic number, which is a fundamental property that identifies the element and determines its place in the arrangement of the elements. The atomic number of an element is the number of a particular kind of tiny particle found in the central core, or nucleus, of the atoms of that element, and this number is unique to each element, so that no two elements have the same atomic number, and it is by this number that the elements are arranged in order in the table of the elements. Hydrogen has the atomic number one, the lowest of all, which means that it has the simplest possible atomic structure, and it is placed first in the arrangement of the elements. Hydrogen is a remarkable element in many ways. It is the lightest of all the elements, and it is a gas that has no colour, no smell and no taste. It is by far the most abundant element in the universe as a whole, making up the greater part of the matter in the stars, including the Sun, where it serves as the fuel for the processes that make the stars shine. On the Earth, hydrogen is not usually found on its own as a free gas, but it is present in very large quantities in combination with other elements, most importantly in water, which is a compound formed from hydrogen and oxygen, and it is also found in the many substances that make up living things and fuels. Hydrogen is highly flammable, and it has various uses, including as a fuel, with great interest in its potential as a clean source of energy, since when it burns it forms water without producing the harmful gases that come from burning other fuels. Being the first and simplest element, with the atomic number one, hydrogen holds a special place in chemistry. The study of the elements, their atomic numbers and their arrangement is a fundamental part of chemistry. For PPSC and other competitive examinations, the key points to remember are that the atomic number of hydrogen is one, that this makes it the first and simplest of all the chemical elements, that the atomic number identifies an element and determines its place in the arrangement of the elements, and that hydrogen is the lightest and most abundant element in the universe and the fuel of the stars.
