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प्रश्न
Fill in the blank
An _______ is electrically neutral.
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उत्तर
An atom is electrically neutral
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संबंधित प्रश्न
WRITE SHORT ANSWER
What is radioactivity?
Define:- Atom
Write the names of `"FeS"` compounds :
Write the names of `"Na"_3"PO"_4` compounds :
What does an atom consist of ? Explain.
State Dalton’s atomic theory.
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 charge on the particle ?
What value has been given to the mass of this reference atom ?
State two observations which show that atom is not indivisible.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Electron, proton, neutron are the types of ______ in an atom.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
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.
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.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
What is the fundamental particle of an element?
The ______ are combination of atoms of various elements or the same element.
