First 20 Elements FAQs
What is the atomic number of hydrogen?
The atomic number of hydrogen is 1.
What is the valency of K, Ne, Ar and N?
The valency of an element is the number of electrons it can gain, lose, or share to achieve a stable electron configuration. Potassium (K) has a valency of 1, Neon (Ne) has a valency of 0, Argon (Ar) has a valency of 0, and Nitrogen (N) has a valency of 3.
Which element has the smallest mass?
The element with the smallest mass is hydrogen. It has an atomic mass of approximately 1.
What is special about the first twenty elements?
The first twenty elements, often referred to as the “first two periods” in the periodic table, hold significance as they represent the building blocks of matter. They include elements from hydrogen to calcium and showcase trends in properties such as atomic size, electronegativity, and reactivity.
Which element has the symbol He and is a noble gas?
Helium (He) is the element with the symbol He, and it is a noble gas.
Which element is commonly used in water purification and has the symbol Cl?
The element commonly used in water purification with the symbol Cl is chlorine.
What is the atomic mass of oxygen?
The atomic mass of oxygen is approximately 16.
First 20 Elements of Periodic Table – Name and Symbols
Elements are the purest form of matter which has only one type of atoms. There are total 118 elements found till date. These elements are arranged in a tabular form in increasing order of atomic number such that elements with common properties are arranged together. This tabular arrangement of elements is called Periodic Table of Elements. In this article, we will learn first twenty elements with atomic number 1 to 20 along with their properties.
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