Question

atomic no. and atomic mass of 1 to 20

Answer 1



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Periodic table

 

Elements atomic number

Chemical elements listed by atomic number

The elements of the periodic table sorted by atomic number

click on any element's name for further chemical properties, environmental data or health effects.

This list contains the 118 elements of chemistry.

The chemical elements of
the periodic chart sorted by:Atomic number

Name chemical element

Symbol- Name alphabetically1HydrogenH- Atomic number2HeliumHe- Symbol3LithiumLi- Atomic Mass4BerylliumBe-Electronegativity5BoronB- Density6CarbonC- Melting point7NitrogenN- Boiling point8OxygenO- Vanderwaals radius9FluorineF- Year of discovery10NeonNe- Inventor surname11SodiumNa- Elements in earthcrust12MagnesiumMg- Elements in human body13AluminumAl- Covalenz radius14SiliconSi- Ionization energy15PhosphorusP

For chemistry students and teachers: The tabular chart on the right is arranged by Atomic number.

The first chemical element is Hydrogen and the last is Ununoctium.

Please note that the elements do not show their natural relation towards each other as in the Periodic system. There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals.

16SulfurS17ChlorineCl18ArgonAr19PotassiumK20CalciumCa21ScandiumSc22TitaniumTi23VanadiumV24ChromiumCr25ManganeseMn26IronFe27CobaltCo28NickelNi29CopperCu30ZincZn31GalliumGa32GermaniumGe33ArsenicAs34SeleniumSe35BromineBr36KryptonKr37RubidiumRb38StrontiumSr39YttriumY40ZirconiumZr41NiobiumNb42MolybdenumMo43TechnetiumTc44RutheniumRu45RhodiumRh46PalladiumPd47SilverAg48CadmiumCd49IndiumIn50TinSn51AntimonySb52TelluriumTe53Iodine

Read more: https://www.lenntech.com/periodic/number/atomic-number.htm#ixzz5GL8bJx2B

Answer 2

Hydrogen

Helium

Litham

Baralium

Boron

Carbon

Nitrogen

Oxygen

Florine

Neon

Sodium

Magnesium

Aluminum

Silicon

Phosphorus

Sulphur

Clorine

Argan

Potassium

Calcium