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प्रश्न
Write the name and symbol of the element from the description.
The atom having the smallest atomic mass.
उत्तर
Name: Hydrogen
Symbol: H
Explanation:
Hydrogen (H) has the smallest atomic mass of 1.008 u. It is the lightest and most abundant element in the universe, playing a crucial role in chemical reactions, including combustion and acid-base reactions.
संबंधित प्रश्न
Answer the following in respect of element `31/15 P `
Give its formula with chlorine?
Why is the size of sodium is greater than magnesium?
Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size
Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are
What happens to the atomic size of elements on moving from left to right in a period?
Supply the missing word from those in the brackets:
If an element has seven electrons in its outermost shell then it is likely to have the ______ (largest/ smallest) atomic size among all the elements in the same period.
Arrange the following as per the instruction given in the bracket.
Mg, Cl, Na, S, Si (increasing order of atomic size)
The changes in the properties of elements on moving from left to right across a period of the Periodic Table. For the property, choose the correct answer.
The atomic size:
Moving from left to right, the size of the atom decreases.
The electronic configuration of metal A is 2, 8, 18, 1.
The metal A when exposed to air and moisture forms B a green layered compound. A with con. H2 SO4 forms C and D along with water. D is a gaseous compound. Find A, B, C, and D.
An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?
When an atom of iodine becomes an iodine ion (I–) the radius will ______
Which of the following are the characteristics of isotopes of an element?
- Isotopes of an element have same atomic masses
- Isotopes of an element have same atomic number
- Isotopes of an element show same physical properties
- Isotopes of an element show same chemical properties
Atomic number of a few elements are given below
10, 20, 7, 14
- Identify the elements
- Identify the Group number of these elements in the Periodic Table
- Identify the Periods of these elements in the Periodic Table
- What would be the electronic configuration for each of these elements?
- Determine the valency of these elements
The diagram below shows part of the periodic table.
- Which elements would react together to form covalent compounds?
- Between the two elements W and Z, which will have a bigger atomic radius? Why?
Arrange the following as per instruction given in the bracket.
Mg, Cl, Na, S, Si (decreasing order of atomic size)
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these have least atomic size in period 3?
