What is the valence number?

Answer 1

Hydrogen-

1

Helium-

0

Lithium-

1

Beryllium-

2

Boron-

3

Carbon-

2, 4

Nitrogen-

3, 5

Oxygen-

2

Fluorine-

1

Neon-

0

Sodium-

1

Magnesium-

2

Aluminium-

3

Silicon-

4

Phosphorus-

3, 5

Sulfur-

2, 4, 6

Chlorine-

1, 3, 5, 7

Argon-

0

Potassium-

1

Calcium-

3, 5

Scandium-

3

Titanium-

3, 4

Vanadium-

2, 3, 4, 5

Chromium-

2, 3, 6

Manganese-

2, 3, 4, 6, 7

Iron-

2, 3

Cobalt-

2, 3

Nickel-

2, 3

Copper-

1, 2

Zinc-

2

Gallium-

2, 3

Germanium-

4

Arsenic-

3, 5

Selenium-

2, 4, 6

Bromine-

1, 3, 5, 7

Krypton-

0

Rubidium-

1

Strontium-

2

Yttrium-

3

Zirconium-

4

Niobium-

3, 5

Molybdenum-

2, 3, 4, 5, 6

Technetium-

2, 3, 4, 6, 7

Ruthenium-

3, 4, 6, 8

Rhodium-

3, 4

Palladium-

2, 4

Silver-

1

Cadmium-

2

Indium-

1, 3

Tin-

2, 4

Antimony-

3, 5

Tellurium-

2, 4, 6

Iodine-

1, 3, 5, 7

Xenon-

0

Caesium-

1

Barium-

2

Lanthanum-

3

Cerium-

3, 4

Praseodymium-

3

Neodymium-

3

Promethium-

3

Samarium-

2, 3

Europium-

2, 3

Gadolinium-

3

Terbium-

3

Dysprosium-

3

Holmium-

3

Erbium-

3

Thulium-

2, 3

Ytterbium-

2, 3

Lutetium-

3

Hafnium-

4

Tantalum-

3, 5

Tungsten-

2, 4, 5, 6

Rhenium-

1, 4, 7

Osmium-

2, 3, 4, 6, 8

Iridium-

3, 4

Platinum-

2, 4

Gold-

1, 3

Mercury-

1, 2

Thallium-

1, 3

Lead-

2, 4

Bismuth-

3, 5

Polonium-

2, 3, 4

Astatine-

1, 3, 5, 7

Radon-

0

Francium-

1

Radium-

2

Actinium-

3

Thorium-

4

Protactinium-

4, 5

Uranium-

3, 4, 5, 6

Neptunium-

2, 3, 4, 5, 6

Plutonium-

2, 3, 4, 5, 6

Americium-

2, 3, 4, 5, 6

Curium-

2, 3, 4

Berkelium-

2, 3, 4

Californium-

2, 3, 4

Einsteinium-

2, 3

Fermium-

2, 3

Mendelevium-

2, 3

Nobelium-

2, 3

Lawrencium-

3

Answer 2

it tells how many electrons are there in an element or compound.

Univalent........table

Univalent 1+

Li

Na

K

A

g

H3o

H

NH4

Cu

Hg

Univalent 1-

F

Cl

Br

I

OH

NO3

HCO3

HSO4

NO2

ClO

MnO4

OCl

H2PO4

-heidikimlinh@Yahoo.com

Answer 3

The Valence is the outer most shell of electrons that an atom will have (2 max per shell).

For example..... S (sulfur) will have 16 electrons and the electrons on that atoms valence will read, 3p4.

Answer 4

Chemical properties

Atomic number Name of element Valency 1 Hydrogen 1 2 Helium 0 3 Lithium 1 4 Beryllium 2 5 Boron 3 6 Carbon 2, 4 7 Nitrogen 3, 5 8 Oxygen 2 9 Fluorine 1 10 Neon 0 11 Sodium 1 12 Magnesium 2 13 Aluminium 3 14 Silicon 4 15 Phosphorus 3, 5 16 Sulfur 2, 4, 6 17 Chlorine 1, 3, 5, 7 18 Argon 0 19 Potassium 1 20 Calcium 3, 5 21 Scandium 3 22 Titanium 3, 4 23 Vanadium 2, 3, 4, 5 24 Chromium 2, 3, 6 25 Manganese 2, 3, 4, 6, 7 26 Iron 2, 3 27 Cobalt 2, 3 28 Nickel 2, 3 29 Copper 1, 2 30 Zinc 2 31 Gallium 2, 3 32 Germanium 4 33 Arsenic 3, 5 34 Selenium 2, 4, 6 35 Bromine 1, 3, 5, 7 36 Krypton 0 37 Rubidium 1 38 Strontium 2 39 Yttrium 3 40 Zirconium 4 41 Niobium 3, 5 42 Molybdenum 2, 3, 4, 5, 6 43 Technetium 2, 3, 4, 6, 7 44 Ruthenium 3, 4, 6, 8 45 Rhodium 3, 4 46 Palladium 2, 4 47 Silver 1 48 Cadmium 2 49 Indium 1, 3 50 Tin 2, 4 51 Antimony 3, 5 52 Tellurium 2, 4, 6 53 Iodine 1, 3, 5, 7 54 Xenon 0 55 Caesium 1 56 Barium 2 57 Lanthanum 3 58 Cerium 3, 4 59 Praseodymium 3 60 Neodymium 3 61 Promethium 3 62 Samarium 2, 3 63 Europium 2, 3 64 Gadolinium 3 65 Terbium 3 66 Dysprosium 3 67 Holmium 3 68 Erbium 3 69 Thulium 2, 3 70 Ytterbium 2, 3 71 Lutetium 3 72 Hafnium 4 73 Tantalum 3, 5 74 Tungsten 2, 4, 5, 6 75 Rhenium 1, 4, 7 76 Osmium 2, 3, 4, 6, 8 77 Iridium 3, 4 78 Platinum 2, 4 79 Gold 1, 3 80 Mercury 1, 2 81 Thallium 1, 3 82 Lead 2, 4 83 Bismuth 3, 5 84 Polonium 2, 3, 4 85 Astatine 1, 3, 5, 7 86 Radon 0 87 Francium 1 88 Radium 2 89 Actinium 3 90 Thorium 4 91 Protactinium 4, 5 92 Uranium 3, 4, 5, 6 93 Neptunium 2, 3, 4, 5, 6 94 Plutonium 2, 3, 4, 5, 6 95 Americium 2, 3, 4, 5, 6 96 Curium 2, 3, 4 97 Berkelium 2, 3, 4 98 Californium 2, 3, 4 99 Einsteinium 2, 3 100 Fermium 2, 3 101 Mendelevium 2, 3 102 Nobelium 2, 3 103 Lawrencium 3

Answer 5

Valency is the amount of electrons available to add or to lose in order to reach a full octet of electrons. For example, Magnesium has a valence of 2. Since there are only two electrons, it would be easier to lose those electrons than to gain more electrons. Therefore, it's electron affinity is low, and its ionization potential is high.

Another example is fluorine. Fluorine has a valence of 7. Naturally it would occur as F2. However, in it's ionic stage as F-, it is highly reactive. It's electron affinity is high (and so is it's electronegativity, meaning it attracts electrons more), and its ionization potential is low.

The main groups of elements (the s and p groups of the periodic table) and their valency can be based on their position. Since there are 7 groups, each one has it's corresponding valency. The first 3 are +. The last 3 are -. I've seen Group 4 elements change all the time. I guess it depends on their isotopes.

All in consideration of Lewis dot diagrams and such.

Answer 6

That is the number of valence electrons, which are he electrons on the outer shell (That can be any shell, not a specific outer shell)

Answer 7

valency is the combining power of an element

Answer 8

The "valency" or valence of an element refers to the number of outermost electrons. It is indicative of the combining power of that element.