Periodic Table Element Comparison: Compare Elements - Helium vs Astatine

Compare Helium and Astatine

Compare Helium and Astatine on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Helium vs Astatine with most reliable information about their properties, attributes, facts, uses etc. You can compare He vs At on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

Name	Helium	Astatine
Atomic Number	2	85
Atomic Symbol	He	At
Atomic Weight	4.002602	210
Phase at STP	Gas	Solid
Color	Colorless	Silver
Metallic Classification	Noble Gas	Halogens
Group in Periodic Table	group 18	group 17
Group Name	helium family or neon family	fluorine family
Period in Periodic Table	period 1	period 6
Block in Periodic Table	p -block	p -block
Electronic Configuration	1s2	[Xe] 4f14 5d10 6s2 6p5
Electronic Shell Structure (Electrons per shell)	2	2, 8, 18, 32, 18, 7
Melting Point	0 K	575 K
Boiling Point	4.22 K	-
CAS Number	CAS7440-59-7	CAS7440-68-8
Neighborhood Elements	Neighborhood Elements of Helium	Neighborhood Elements of Astatine

History	The element Helium was discovered by P. Janssen and N. Lockyer in year 1868 in Sweden and United Kingdom. Helium derived its name from the Greek word helios, meaning 'sun'.	The element Astatine was discovered by R. Corson,R. MacKenzie and E. Segrè in year 1940 in United States. Astatine derived its name from the Greek astatos, 'unstable'.
Discovery	P. Janssen and N. Lockyer (1868)	R. Corson,R. MacKenzie and E. Segrè (1940)
Isolated	W. Ramsay,T. Cleve, and N. Langlet (1895)	()

Abundance in Universe	230000000 / 72000000	- / -
Abundance in Sun	230000000 / 74000000	- / -
Abundance in Meteorites	- / -	- / -
Abundance in Earth's Crust	5.5 / 30	- / -
Abundance in Oceans	0.0072 / 0.011	- / -
Abundance in Humans	- / -	- / -

Atomic Volume	22.4136 cm3/mol	-
Atomic Radius	31 pm	127 pm
Covalent Radius	32 pm	-
Van der Waals Radius	140 pm	202 pm
Atomic Spectrum
Lattice Constant	424.2, 424.2, 424.2 pm	-
Lattice Angle	π/2, π/2, π/2	-
Space Group Name	Fm_ 3m	-
Space Group Number	225	-
Crystal Structure	Face Centered Cubic	Face Centered Cubic

Atomic Number	2	85
Number of Electrons (with no charge)	2	85
Number of Protons	2	85
Mass Number	4.002602	210
Number of Neutrons	2	125
Shell structure (Electrons per energy level)	2	2, 8, 18, 32, 18, 7
Electron Configuration	1s2	[Xe] 4f14 5d10 6s2 6p5
Valence Electrons	1s2	6s2 6p5
Oxidation State	-	-1, 1
Atomic Term Symbol (Quantum Numbers)	1S0	2P3/2
Shell structure

Known Isotopes	3He, 4He, 5He, 6He, 7He, 8He, 9He, 10He	193At, 194At, 195At, 196At, 197At, 198At, 199At, 200At, 201At, 202At, 203At, 204At, 205At, 206At, 207At, 208At, 209At, 210At, 211At, 212At, 213At, 214At, 215At, 216At, 217At, 218At, 219At, 220At, 221At, 222At, 223At
Stable Isotopes	Naturally occurring stable isotopes: 3He, 4He
Neutron Cross Section	0.007	-
Neutron Mass Absorption	0.00001	-

Valence or Valency	0	7
Electronegativity	-	2.2 Pauling Scale
Electron Affinity	0 kJ/mol	270.1 kJ/mol
Ionization Energies	1st: 2372.3 kJ/mol 2nd: 5250.5 kJ/mol	1st: 899.003 kJ/mol

Density	0.0001785 g/cm3	-
Molar Volume	22.4136 cm3/mol	-
Elastic Properties
Young Modulus	-	-
Shear Modulus	-	-
Bulk Modulus	-	-
Poisson Ratio	-	-
Hardness - Tests to Measure of Hardness of Element
Mohs Hardness	-	-
Vickers Hardness	-	-
Brinell Hardness	-	-
Electrical Properties
Electrical Conductivity	-	-
Resistivity	-	-
Superconducting Point	-	-
Heat and Conduction Properties
Thermal Conductivity	0.1513 W/(m K)	2 W/(m K)
Thermal Expansion	-	-
Magnetic Properties
Magnetic Type	Diamagnetic	-
Curie Point	-	-
Mass Magnetic Susceptibility	-5.9e-9 m3/kg	-
Molar Magnetic Susceptibility	-2.36e-11 m3/mol	-
Volume Magnetic Susceptibility	-1.05e-9	-
Optical Properties
Refractive Index	1.000035	-
Acoustic Properties
Speed of Sound	970 m/s	-

CAS Number	CAS7440-59-7	CAS7440-68-8
RTECS Number	RTECSMH6520000	-
DOT Hazard Class	2.2	-
DOT Numbers	1963	-
EU Number	-	-
NFPA Fire Rating	0	-
NFPA Hazards	-	-
NFPA Health Rating	1	-
NFPA Reactivity Rating	0	-
AutoIgnition Point	-	-
Flashpoint	-	-

Periodic Table Element Comparison: Compare Elements - Helium vs Astatine

Compare Helium and Astatine

Facts

History

Presence: Abundance in Nature and Around Us

Crystal Structure and Atomic Structure

Atomic and Orbital Properties

Isotopes and Nuclear Properties

Chemical Properties: Ionization Energies and electron affinity

Physical Properties

Elastic Properties

Hardness - Tests to Measure of Hardness of Element

Electrical Properties

Heat and Conduction Properties

Magnetic Properties

Optical Properties

Acoustic Properties

Thermal Properties - Enthalpies and thermodynamics

Enthalpies

Regulatory and Health - Health and Safety Parameters and Guidelines

Compare With Other Elements

Compare Helium with all Group 18 elements

Compare Helium with all Period 1 elements

Compare Helium with all Noble Gas elements

Compare Astatine with all Group 17 elements

Compare Astatine with all Period 6 elements

Compare Astatine with all Halogens elements