- Atoms are made up of three kinds of particles:…………..………………,electrons and neutrons.
- ………………… have a negative electrical charge.
- …………………..have no electrical charge.
- Mass number tells the number of protons and ………………………..each atom of an element contains.
- Electrons are moving in electron …………………… or orbits around the nucleus.
- Group 1 elements in the periodic table are known as …………………………….
- Group 7 elements are called ……………………………….
- Group 8 elements are known as …………………………………
- Aluminium has an electronic structure of 2,8,3 .
(a) Which one of these diagrams shows the electronic structure of Aluminium (Al):
(b) How many electrons are there in Aluminium?
(c) How many protons and neutrons are there in Aluminum, if the mass number of Aluminium is approximately 27?
10. Periodic table shows the elements in order of their ……………………………………number.
11. Hydrogen forms positive ion (H+) like ……………………..metals.
12. Group VII metals are known as ……………..
A. Noble gases
B. halogens
C. alkaline earth metals
D. transition metals
13. Group VIII elements are known as ……………………
A. Inert gases
B. alkali metals
C. alkaline earth metals
D. halogens
14. A solution with a low concentration of solute is a concentrated solution. ……………
15. If there is a high concentration of solute, the solution is dilute. ……………………
16. Which one of the groups have mono atomic elements:
A. Group I
B. Group VII
C. Group VIII
D. None of these
17. The horizontal rows in a periodic table are called……………………………..
18. The vertical columns in a periodic table are called…………………………….
19. There are …………………. elements in a periodic table.
20. Complete the following table with Symbols/Greek or Latin or German Name/Elements Name appropriately wherever required:
| Element’s Name | Greek/Latin/German | Chemical Symbol |
| Tungsten | ||
| Hg | ||
| Natrium | ||
| Antimony | ||
| Silver | Ag |
21. Write the name of the atomic model in the box along with the picture:
| Model Numbers | Atomic Model | Atomic Model’s Name |
| A | ||
| B | ||
| C |
22. Circle the element out from the following options:
A. Sodium
B. Sodium bicarbonate
C. Water
23. Circle the compound out from the following options:
A. Potassium
B. Sodium chloride
C. Aluminium
24. Circle the mixture out from the following options:
A. Sand and stones
B. Salt and pepper
C. Sodium carbonate
25. Write in two sentences about the observation of Rutherford’s Gold foil experiment.
………………………………………………………………………………………………………………………………..
…………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………..
Comments
1)proton 2)electron 3)neutron 4)neutron 5) 6)alkali metal 7)halogens 8) noble gases 9(a),(13) 10) increasing atomic number 11)nonmetal 12)b 13)A 14)dilute solution 15)hypertonic solution 16) group zero 17)period 18)groups 19)1118 20) sewdish W, mercury hydragyrum, sodium na,stibium sb, argentum 22) sodium, 23)a 24)c 25)most of the fast moving a particles passed straight through the gold foil, most of the space in an atom is empty
1)proton 2)electron 3)neutron 4)neutron 5) 6)alkali metal 7)halogens 8) noble gases 9a,13 10)increasing atomic number 11)nonmetal 12)b 13)A 14)dilute solution 15)hypertonic solution 16)group 0 17)period 18)groups 19)118 20)sewdish W, mercury hydragyrum, sodium na,stibium sb, argentum 22) sodium, 23)a 24)c 25)most of the fast moving a particles passed straight through the gold foil, most of the space in an atom is empty
1 protons
2 electrons
3 neutrons
4 neutrons
5 energy levels
6 alkali metals
7 halogen
8 noble gases
9 (a) A (b) 13 (c) 27
10 atomic
11 alkali
12 B
13 A
14 dilute solutions
15 concentrated solutions
16 C
17 periods
18 groups
19 118
20 Tungsten wolfram. W
Mercury. Hydragyrum. Hg
Sodium. Natrium. Na
Antimony. Stibium. Sb
Silver. Argentum. Ag
21 (a) solid sphere model John dalton
(b) plum pudding model. J.J.Thomson
(c) planetary model. Niels bohr
22 A
23 B
24 A
25 1.Almost all the alpha particles did pass through the foil.
2.Some alpha particles were deflected off at different angles as observed at the screen of the detector.
3.Very few of the alpha particles (one or two) even bounced backwards after hitting the gold foil.
1.proton 2.electron 3.neutron 4.neutron 5.
6.alkali metal 7.halogens noble gases 9.a(13)
10. increasing atomic number 11.nonmetal 12.b 13.a 14.dilute solution 15.hypertonic solution
16.group zero 17.period 18.groups 19.1118
20.sewdish W, mercury hydragyrum,
sodium na,stibium sb, argentum 22. sodium
23.a 24.c 25.most of the fast moving a particles passed straight through the gold foil ,space in atom is empty