Element 5. Common compounds are; boric acid, colemanite, kernite, ulexite, and borates.
What is Boron
200
k
What is Potassium
200
Ar
What is Argon
200
period 4,group 1
What is Potassium
200
63
What is Eu, Europium
200
It has fourteen protons and Jacob Berzelius discovering this element in 1824.
What is Silicon
300
Ba
What is Barium
300
Xe
What is Xenon
300
Period 2, group 17
What is Fluorine
300
53
What is I, Iodine
300
Used to harden alloys, specifically lead and copper. This element has three common allotropes, gray, yellow, and black. Yellow is the most unstable and the most poisonous.
What is Arsenic
400
kr
What is Krypton
400
Og
What is Oganesson
400
period 8, group 9
What is Gd, Gadolinium
400
42
What is Mo, Molybdenum
400
Element 33 is highly brittle, bluish-white, semi-metallic element and is found in nature mainly as the sulfide mineral stibnite.
What is Antimony
500
Rn
What is Radon
500
Ne
What is Neon
500
period 6, group 10
What is Pt, Platinum
500
85
What is At, Astatine
500
a chemical element with symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur. It is occasionally found in native form as elemental crystals