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प्रश्न
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
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उत्तर
- Atoms with no electron will have mass, because mass depends on number of Protons and Neutrons though it has no electron.
- Atoms can exist without electrons, Matter is build out of neutrons, protons (+) and electrons (-). Matter becomes stable only if it is electrically neutral.
- So atoms without electrons do exist and must have their own states (charged or uncharged transfered back and forth in their environment)
- Example: He2+. It has 2 protons and 2 neutrons but no electrons.
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संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
Write the names of the elements present in the:-
Ammonia
Define: Mass number
Define: Covalent bond
Give two examples for each of ionic and covalent bond.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
State Dalton’s atomic theory.
How did Neils Bohr visualise the atom ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
How is the size of an atom indicated ?
Electron, proton, neutron are the types of ______ in an atom.
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.
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
An element is composed of ______ atoms.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
1 mole of Gold and Silver contain same number of atoms.
The graphite refill used is pencil is made of element called ______.
What are the 3 most abundant atoms on the earth?
