Hydrogen is found in very low concentrations in Earth's atmosphere. Most of the hydrogen is bound with oxygen to form water. Even then, it seems to lack in abundance. The main reason is that the strong solar wind of the young sun stripped away most of the hydrogen billions of years go.
7th period because atomic size down the group increases. And Alkali Earth metals are found only in Group 1. The element is in Group 1 and period 7
less than 2 (1)
Silicon is the element in the Earth's crust that has 14 protons. Quartz is crystallized Silicon Dioxide. Flint is also silicon dioxide. The compounds of Silicon are known as silicates.
No scientist found the Earth.
Boron is considered to be a relatively rare element on Earth, with an abundance of about 0.001% in the Earth's crust. However, it is found in various minerals and compounds, and is an essential nutrient for plants.
Copper's abundance in the Earth's crust is approximately 50 parts per million, making it a relatively abundant element. It is widely distributed throughout the Earth's crust and is commonly found in various ores and minerals.
The abundance of gallium in Earth's crust is approximately 19 parts per million. It is a relatively rare element, found primarily in trace amounts in various minerals and ores.
Vanadium is considered a relatively rare element in the Earth's crust, with an abundance of about 150 parts per million. It is typically found in certain minerals and as a trace element in fossil fuels.
Lawrencium is a very rare element and not found naturally on Earth. It is exclusively produced in laboratories through nuclear reactions and has only been produced in very small quantities. Its relative abundance is extremely low compared to other elements.
The concentration of radium in the Earth's crust is estimated to be about 1 part per trillion. Radium is a naturally occurring radioactive element that is found in trace amounts in rocks and minerals.
The abundance of barium is 456 parts per million (numbers of atoms). That is 0.05 per cent, approx.
Silicon is found in abundance in the Earth's crust, primarily in the form of silica and silicate minerals. It is also found in sand, quartz, and various rocks. Silicon is the second most abundant element in the Earth's crust after oxygen.
Sodium is the 6th most abundant element on Earth, making up about 2.6% of the Earth's crust. It is also found in seawater, where it is the 6th most abundant element overall.
Platinum is considered a rare element on Earth, with an estimated abundance of about 0.005 parts per million in the Earth's crust. It is mostly found in association with other metals such as nickel and copper ores. Platinum is also found in small quantities in meteorites and certain types of rocks.
Almost every element from hydrogen to uranium (going from smallest to biggest) is found naturally on Earth. Technitium is not found naturally on Earth, it is the exception. The trans-uranic elements are also not found naturally on Earth.
Abundance of radium in the earth crust: 9.10-10 mg/kg Abundance of radium in the sea water: 8,9.10-14 mg/L