What Is The Lightest Element In The Periodic Table

Hydrogen is the simplest and lightest element and the most common in the entire universe.

Hydrogen is the simplest and lightest element and the most common in the entire universe. Hydrogen h was named by laviosier and is the most abundant element on the periodic table. The lightest chemical elements are hydrogen and helium both created by big bang nucleosynthesis during the first 20 minutes of the universe in a ratio of around 3 1 by mass or 12 1 by number of atoms along with tiny traces of the next two elements lithium and beryllium almost all other elements found in nature were made by various natural methods of nucleosynthesis. Hydrogen it has an atomic mass of 1 00794 amu which makes hydrogen the lightest element on the periodic table.

1 008 you may try other alternate answer. When placed in water they burn or explode. As the most electronegative element it is extremely reactive as it reacts with all other elements except for argon neon and helium. Hydrogen is the lightest element because it consists simply of a single proton and sometimes a neutron deuterium.

It s the first in the family of alkali metals in the table and has the smallest atomic number of any metal in this case 3 which tells us the number of protons in the atom. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Hydrogen has no neutrons helium has two lithium has four and beryllium has five and the masses of the elements increase in that order. Fluorine is a chemical element with the symbol f and atomic number 9.

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93 per cent of all atoms in the universe are hydrogen atoms. Hydrogen helium lithium and beryllium are the lightest four elements with one two three and four protons respectively. Hydrogen and helium are gases whereas lithium and beryllium are metals. Answer to the question what is the atomic weight of the lightest element on the periodic table.

While lithium potassium and sodium are all light enough to float on water they are also highly reactive. 93 per cent of all atoms in the universe are hydrogen atoms. All of the other metals on the periodic table are denser than water.