Advertisements
Advertisements
प्रश्न
The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
विकल्प
CO
AL
He
So
उत्तर
He
He is the correct symbol of helium.
APPEARS IN
संबंधित प्रश्न
Define atomic mass unit. What is its symbol ?
Give two examples of the following:
Liquid + Liquid mixture:
Match the noble gases – with their correct symbols:
| Noble gases | Symbols |
| (a) Helium | (1) Ar |
| (b) Neon | (2) Xe |
| (c) Argon | (3) Rn |
| (d) Krypton | (4) He |
| (e) Xenon | (5) Kr |
| (f) Radon | (6) Ne |
Give the names and symbols of the first twenty elements of the periodic table.
State what a chemical formula denotes.
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
K1+ Cl1-
State the type of element for the following:
Carbon
State the type of element for the following:
Neon
Give the symbol of the following element:
Hydroxide
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Oxide
