Unit 1 - Lesson 3: Atomic structure of matter

1
The symbol of copper atom is...........
2

3
The chemical symbol of nitrogen atom is..........
4
Pb is the symbol of......... atom.
5
Silver is symbolized by............
6
The atom nucleus contains..........
7
........... are neutral particles exist in the nucleus.
8
The atomic number of the atom of an element equals the...........
9
The sum of the numbers of protons and neutrons in the nucleus of the atom is known as.........
10
The mass of the atom is concentrated in the ...........
11
The mass number of an atom having 13 electrons and 14 neutrons equals...........
12
The atomic number of an element having 6 protons in its nucleus is............
13
The nucleus of.......... atom doesn't contain neutrons.
14
When atomic number of an element equals its mass number. This means that there aren't.......... in the nucleus of this element.
15
Negative charged particles of negligible mass are..........
16
The particles which revolve around the nucleus of an atom of element area.........
17
The maximum number of energy levels in the heaviest known atoms is...........
18
The energy of the electron is........... the energy of the level which it revolves in.
19
The energy of the excited atom is.......... the energy of the atom in its ground state.
20
The number of electrons that saturates the first four energy levels can be calculated from the relation............
21
The rule 2n² cannot be applied to the energy level...........
22
The third energy level is saturated with........... electrons.
23
The outermost energy level of neon atom (Ne) has (10 proton) contains.......... electrons.
24
The electrons of potassium atom (K) has (19 proton) are distributed in......... energy level(s).
25
The atomic number of an element has 2 electrons in "L" level is