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प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
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उत्तर
Y
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 |
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
Fill in the blank:
Atoms are _____
What does an atom consist of ? Explain.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
How did Neils Bohr visualise the atom ?
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
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?
Draw the electron dot structure of this compound.
A compound containing one atom of carbon and two atoms of oxygen is ______.
The basic unit of matter is ______.
State true or false. If false, correct the statement.
An atom is electrically neutral.
K: Potassium:: C: ______.
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.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Which of the following has maximum number of atoms?
The graphite refill used is pencil is made of element called ______.
The first scientific theory about atoms was given by J J. Thomson.
