Advertisements
Advertisements
प्रश्न
Who originated the word ‘atom’ ?
उत्तर
Democritus
APPEARS IN
संबंधित प्रश्न
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:-
Glucose
Write the names of `"Na"_3"PO"_4` compounds :
Define: Covalent bond
Fill in the blank
A charged particle is called an _____
Fill in the blank
An _______ is electrically neutral.
Write the full form of IUPAC.
Write the relation between nanometre and metre.
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?
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.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Define the following term with an example.
Element
Name the sub-atomic particles.
Define the following term with an example.
Compound
Define the following term with an example.
Metal
Which of the following has maximum number of atoms?
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?
What are the 3 most abundant atoms on the earth?
