Advertisements
Advertisements
рдкреНрд░рд╢реНрди
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Advertisements
рдЙрддреНрддрд░
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number = Mass number - Number of protons = 23 − 11 = 12 |
| \[\ce{_6^14C}\] | Mass number = 14 |
| \[\ce{_17^37 Cl}\] | Proton number = Atomic number = 17 |
APPEARS IN
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНрди
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?
Define:- Molecule
Write the names of `("NH"_4)_2"SO"_4` compounds:
Write the names of `"FeS"` compounds :
Define: Ions
Define: Mass number
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Who originated the word ‘atom’ ?
What does the word ‘atom’ mean?
Fill in the blank
An excess of electrons produces a ________ charge.
Which of the following statement is correct about the atom of an element ?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
The electron shell ______ is nearest to the nucleus.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Compound
An element is composed of ______ atoms.
The graphite refill used is pencil is made of element called ______.
