Question

Which of these elements is a noble gas?
hydrogen (H)
barium (Ba)
nitrogen (N)
krypton (Kr)
bromine (Br)

Answer 1

Kr, it is in group 8.

Answer 2

Refer to the periodic table
http://ptable.com/

Noble gases are the most right column

Answer 3

Noble gases have full actet which means 8 electrons in their last shell
and we know that each Group in periodic table shows how many electrons those elements have in their last shell
thus Group 8 elements are noble gases.

Answer 4

@somy @kametri7
In my table, noble gases are in group 18...
Group 8 consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs).

Answer 5

My bad, group 8a

Answer 6

So Fe would be 8b

Answer 7

You're probably using a different grouping system.

Answer 8

no @thomaster thats not like that
group 18 - means group 8
its because of transitions elements that its group 18

Answer 9

hmm i guess thats because im russian .-.
https://www.google.ae/search?q=%D0%BF%D0%B5%D1%80%D0%B8%D0%BE%D0%B4%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B0&hl=en&source=lnms&tbm=isch&sa=X&ei=bHHFU-m4H7T24QTXjYHYDQ&ved=0CAYQ_AUoAQ&biw=962&bih=683#facrc=_&imgdii=_&imgrc=09GhcN5r4M9NBM%253A%3BAtVCvSs380WZGM%3Bhttp%253A%252F%252Fwww.uniload.ru%252Fimg%252F5xx%252Fmendeleev's_periodic_table.jpg%3Bhttp%253A%252F%252Fwww.uniload.ru%252Fru%252F500%252F540%252F%3B1500%3B1032

Answer 10

Hmm, at my university we use these groupings: http://ptable.com/

Answer 11

This is not modern periodic table

Answer 12

That's Mendeleev's Periodic table

Answer 13

<.< we use this in Russia

Answer 14

Mendeleev was russian !

Answer 15

"Under an international naming convention, the groups are numbered numerically from 1 to 18 from the leftmost column (the alkali metals) to the rightmost column (the noble gases). Previously, they were known by roman numerals"

Answer 16

yep

Answer 17

Russia is outdated :P

Answer 18

Also there was no group for noble gas in original mendeleev's periodic table.

Answer 19

@thomaster i just remembered
group 11- 1
12- 2
13- 3
14 - 4
15- 5
16 - 6
17 - 7
18 - 8

Answer 20

actually, 18=8B

Answer 21

@Abhisar please, i know my own history =_=

Answer 22

LOL...when did i said about ur history...i just shared a fact >_<

Answer 23

all transition elements are in B....

Answer 24

S or P block = A
D block = B

Answer 25

This was the limitation of mendeleev's period.

Answer 26

So 18 = 8A since it's in the P block

Answer 27

yes....i just got it..@thomaster

Answer 28

please Mendeleev predicted existence of noble gases thus he left one column free .-.

Answer 29

and yeah see @thomaster both periodic tables are same
its just yours separates transition elements from the rest of the table thats it

Answer 30

I will post my next reply only if u admit that this is not getting personal....

Answer 31

Because i never meant like that !

Answer 32

.-. i got it i got it chill
im just not in the mood so ~_~ sorry i was a bit rude <.< i think umm

Answer 33

No it's ok !