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प्रश्न
Write the full form of IUPAC.
उत्तर
The full form of IUPAC is International Union of Pure and Applied Chemistry.
APPEARS IN
संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
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 |
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
Write the names of the elements present in the:-
Acetic acid
Write the names of `"FeS"` compounds :
What does an atom consist of ? Explain.
Name the particle or particles you would expect to find in :
The nucleus of an atom
Why is it not possible to see an atom even with the most powerful microscope ?
How many times is a proton heavier than an electron?
State two observations which show that atom is not indivisible.
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.
Which of the following statement is correct about the atom of an element ?
The electron shell ______ is nearest to the nucleus.
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Which of the following has maximum number of atoms?
The smallest unit of an element is ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
Lead is also known as plumbum.
