Question

worlds top 10 rarest non metals

Answer 1

Answer:

NUMBER SYMBOL ELEMENT

1 H Hydrogen

2 He Helium

6 C Carbon

7 N Nitrogen

8 O Oxygen

9 F. Fluorine

10. Ne Neon

16 S Sulfur

17 Cl Chlorine

18 Ar Argon

34 Se Selenium

35 Br Bromine

36 Kr Krypton

53 I Iodine

54 Xe Xenon

85 At Astatine

86 Rn Radon

117 Ts Tennessine

118 Og Oganesson

Answer 2

Answer:

Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements.

• Naming: after Greek astatos (αστατος), meaning "unstable"

Natural occurrence: from decay

• Atomic number (Z): 85

Mass number: 210