Boron 5

Atomic No. Order:

Alphabetic Order:

Periodic Table

B
5

Al
13

Ga
31

In
49

Tl
81

Uut
113

Uht
163

But
213

Boron

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

10.811

Atomic Radius pm

First Ionisation Energy
kJ mol ^-1

800.6

Ionization energy (eV)

8,2980

Electronegativity

2.04

Density kg m ^-3

2340 (²-rhomb.) [293 K]

Molar Volume cm ³

4.62

Thermal Conductivity
W m ^-1 K ^-1

27.0 [300 K]

Melting Point K

2573

Boiling Point K

3931

Number of Isotopes

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

2p ¹

Ground State Electron
Configuration

[He] 2s ²

2p ¹

Ground State Electron
Co nfiguration with
free Orbitals (n= 5)

0, 5

Ground State Electron
Configuration with
compressed Orbitals (n=0)

0, 0

Singularity

	s	p		d	f	g	h	i	j
1	2
2	2	1	5
3
4
5
6
7
8

Term Symbol

2P _1/2

Discovery

Discovered by L.J. Thenard and L.J. Lussac (Paris, France) and Sir H. Davey (London, England) in 1808

Name Derived From

Arabic buraq

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