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प्रश्न
Give two examples for each of ionic and covalent bond.
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उत्तर
Example of ionic bonds— Sodium chloride and calcium oxide.
Example of covalent bond— Water, carbon dioxide.
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 |
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Atom
Write the names of `("NH"_4)_2"SO"_4` compounds:
Fill in the blank:
Atoms are _____
Give the charge and the mass of an electron, proton and neutron present in an atom ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Define: An Atom:
Write the full form of IUPAC.
State two observations which show that atom is not indivisible.
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?
Electron, proton, neutron are the types of ______ in an atom.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
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
An element is composed of ______ atoms.
Atoms of different elements having the same number of ______ are called isotones.
1 mole of Gold and Silver contain same number of atoms.
The graphite refill used is pencil is made of element called ______.
