Elements; Argon, Rhodium, & Protactinium.
By: Morgan Brandi(:
Argon
1. Atomic number – 18
(Electrons -18, Neutrons –
22)
2. Atomic weight – 39.948
3. Element classification
– nonmetal
4. Period group – 3
5. Group name – noble
gas
6. Number of stable
isotopes – 3. (Calcium)
7. Argon was discovered by Sir William Ramsay, a Scottish
chemist and Lord Rayleigh an English chemist in 1894.
8. Argon makes up .93% of the earth’s atmosphere, making it
the 3rd most abundant gas.
9. Element configuration – 1s2, 2s2, 2p6, 3s2, 3p6.
(36x.003365 + 38x.00632+40x.996003 = 40.2014)
1. Atomic number – 45 (Electrons 45, Neutrons 58)
2. Atomic weight – 102.905
3. Element classification – metal
4. Group name – none
5. Number of stable isotopes – 1
Protactinium
1. Atomic number – 91 (Electrons –
91, neutrons – 140)
2. Atomic weight – 231.035
3. Element classification – metal
4. Group name – actinide
1. Number of stable isotopes – 0
5. RADIOACTIVE
2. Protactinium was first identified by
Kasimir Fajans and O.H. Gohring in
6. Period number- 7
1913 while studying uranium’s decay
chain. Protactinium is a rare, poisonous
and expensive element that is present in
uranium ores in very small amounts.
3. Electron configuration – 1s2, 2s2,
2p6, 3s2, 3p6, 3d10, 4s2, 4p6, 4d10,
4f14, 5s2, 5p6, 5d10, 5f2, 6s2, 6p6, 6d1,
7s2.
Works Cited.
http://education.jlab.org/itselemental/ele018.html
….. The End!