What is the atomic number of an element is 20
- What element has the atomic number of 20
- What element has the atomic number of 200
- What is the atomic number of an element with 20 protons
- What is the atomic number of an element that has 20 protons
- What is the atomic number of an element with 20 protons and 20 neutrons
- The atomic number of an element is 20 write its electronic configuration
- What happens when the atomic number of an element is more than 20
- What is the atomic number of an element that has 20 protons and 20 neutrons
- What is the atomic number of the first 20 element
- What is the number of protons of an element whose atomic number is 20
- What is the valency of an element with atomic number 20
- What is the nature of an element having atomic number 20
- The atomic number of an element is 20 what is the electronic configuration of the element