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Question
Fill in the blank
A deficiency of electrons produces a ________ charge.
Solution
A deficiency of electrons produces a positive charge.
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Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
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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 |
Fill in the blank:
Atoms are _____
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An ion with negative charge is called _______
State Dalton’s atomic theory.
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Why is it not possible to see an atom even with the most powerful microscope ?
What is an atom ? How do atoms usually exist ?
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
What is the contribution of the following in atomic structure?
Maharshi Kanada
In what respects do the three isotopes of hydrogen differ? Give their structures.
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 electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Define the following term with an example.
Non-metal
______ is the smallest particle of an element.
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
The most abundant type of atom is the universe is ______.
The ______ are combination of atoms of various elements or the same element.
