Which halogens are diatomic?

Question

Apparently they all are. I thought it was just the top 4 and not At. I am thinking of the rule of 7 (H, N, O, F, Cl, Br, and I are all diatomic). Is At diatomic too?

Answer 1

fluorine
chlorine
bromine
iodine

as for At
This highly radioactive element has been confirmed by mass spectrometers to behave chemically much like other halogens, especially iodine (it would probably accumulate in the thyroid gland like iodine). Astatine is thought to be more metallic than iodine. Researchers at the Brookhaven National Laboratory have performed experiments that have identified and measured elementary reactions that involve astatine; however, chemical research into astatine is limited by its extreme rarity, which is a result of its extremely short half-life. Its most stable isotope has a half-life of around 8.3 hours. Also, when astatine finishes decaying it becomes an isotope of lead.

Astatine is the rarest naturally-occurring element, with the total amount in Earth's crust estimated to be less than 1 oz (28 g) at any given time; this amounts to less than one teaspoon of the element. The Guinness Book of Records has dubbed the element the rarest on Earth, stating: "Only around 0.9 oz (25 g) of the element astatine (At) occurring naturally"; Isaac Asimov, in a 1955 essay on large numbers, scientific notation, and the size of the atom, wrote that in "all of North and South America to a depth of ten miles", the number of astatine atoms at any time was "only a trillion".

Answer 2

H and O are not halogens the ones that are halogens and diatomic is F,Cl, Br, and I


be careful with the wording

Answer 3

most of it... they make a share covalent bond on 1 electron each atom.. u can say all of it inside boundary that it's not a radioactive halogen..

Answer 4

all of the halogens are diatomic

Answer 5

All are