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प्रश्न
Define the following term with an example.
Metalloid
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उत्तर
Metalloid: Metalloid is a chemical element that exhibits some properties of metals and some of non-metals. Metalloids are generally semi-conductors.
Ex.: Silicon. Arsenic, Antimony and Boron.
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 |
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
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
State Dalton’s atomic theory.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Name the three subatomic particles present in an atom.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Name the unit in which the radius of an atom is usually expressed.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
In all atoms of an element
Which of the following has maximum number of atoms?
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Write any two observations which support the fact that atoms are divisible.
Lead is also known as plumbum.
