Atomic Number
1
Element 1
Hydrogen (H)
Hydrogen is the simplest and lightest element, consisting of one proton and one electron. It is the most abundant chemical substance in the universe.
Atomic Mass
1.008 u
Category
Nonmetal
Period
1
Group
Group 1: alkali metals and hydrogen
Phase
gas
Density
0.00008988 g/cm3
Electron Shells
1
Atomic Structure
Protons: 1. Electrons: 1. Neutrons: Varies by isotope.
Electron configuration: 1s¹
Why Hydrogen Matters
Hydrogen helps connect atomic number 1, nonmetal behavior, period 1 trends, and electron shell structure. Its gas phase, atomic mass of 1.008 u, and electron configuration 1s¹ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Hydrogen was discovered 1766 by Henry Cavendish. Hydrogen is the simplest and lightest element, consisting of one proton and one electron. It is the most abundant chemical substance in the universe.
Safety and Handling Context
Hydrogen is a gas at standard conditions. Gas cylinders and concentrated gases should be handled only with proper ventilation and equipment.
Related Elements
Frequently Asked Questions
- What is the atomic number of Hydrogen?
- Hydrogen has atomic number 1, which means a neutral atom has 1 protons and 1 electrons.
- What is the chemical symbol for Hydrogen?
- The chemical symbol for Hydrogen is H.
- What category is Hydrogen in?
- Hydrogen is classified as a nonmetal and sits in period 1 of the periodic table.
Explore Hydrogen in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Hydrogen to neighboring elements without losing your place.