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प्रश्न
Fill in the blank
If an atom gains an electron, it is called an _______
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उत्तर
If an atom gains an electron, it is called an anion
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संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
Fill in the blank:
Atoms are _____
Define: Chemical bond
What does an atom consist of ? Explain.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Give two examples for each of ionic and covalent bond.
Who originated the word ‘atom’ ?
Name the particle or particles you would expect to find in :
The orbit of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Why is it not possible to see an atom even with the most powerful microscope ?
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
What value has been given to the mass of this reference atom ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Draw the electron dot structure of this compound.
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
The smallest particle of matter that can exist by itself is ______.
A compound containing one atom of carbon and two atoms of oxygen is ______.
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
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- Thomson’s atomic model
- Bohr’s atomic model
