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प्रश्न
Define – Atom.
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उत्तर
An atom is the smallest particle of a chemical element that retains its chemical properties.
APPEARS IN
संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define:- Atom
Name the particles which revolve around the nucleus.
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Covalent bond
State Dalton’s atomic theory.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Name the three subatomic particles present in an atom.
How many times is a proton heavier than an electron?
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Name the gas that.
Turns moist starch iodide paper blue black.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
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 smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
The basic unit of matter is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Name the sub-atomic particles.
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.
Which of the following statements made by Dalton has not undergone any change?
______ is the smallest particle of an element.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Write any two observations which support the fact that atoms are divisible.
The graphite refill used is pencil is made of element called ______.
The ______ are combination of atoms of various elements or the same element.
