Advertisements
Advertisements
प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Advertisements
उत्तर
X
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Fill in the blank
An ion with negative charge is called _______
Define: Ions
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The orbit of an atom
Fill in the blank
If an atom gains an electron, it is called an _______
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?
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Draw the electron dot structure of this compound.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The most abundant type of atom is the universe is ______.
The first scientific theory about atoms was given by J J. Thomson.
