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Question
State Dalton’s atomic theory.
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Solution
- Matter is made up of tiny particles called atoms
- Atoms are indivisible.
- Atom can be neither be created nor destroyed.
- Atoms of same element are identical in mass and properties
- Atoms of different elements differ in mass and properties
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RELATED QUESTIONS
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 |
WRITE SHORT ANSWER
Define an ionic compound.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Atom
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Glucose
Define: Covalent bond
What does the word ‘atom’ mean?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Fill in the blank
A charged particle is called an _____
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?
Which of the following statement is correct about the atom of an element ?
Draw the electron dot structure of this compound.
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.
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.
Define the following term with an example.
Compound
Define the following term with an example.
Metal
Atoms of different elements having the same number of ______ are called isotones.
The ______ are combination of atoms of various elements or the same element.
