Graduation of Elements properties - Lesson 2 | Baamboozle - Baamboozle

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21. The electronic configuration of negative ion is like that of the nearest inert gas following its atom in the periodic table. true or false

true

15. A covalent polar compound that has lower polarity than water and has three single covalent bonds is known as …………….

ammonia NH3

5. ………………. indicates the number of electrons that revolve in energy levels

atomic number

12. The atomic size …………. in the same group by …………. The atomic number.

increases , increasing

20. The number of energy levels in a positive ion is less than its atom. true or false

true

14. The difference in electronegativity of two elements can form …………,.………………, and………………….

polar compound , non-polar compound , ionic compound

13. The smallest atomic size element is located at the …………… of the periodic table, while the largest atomic size element is located at the …………. of the periodic table

top , bottom

8. Mendeleev explained his periodic table in his book ………….

principals of chemistry

9. Each main energy level consists of a certain number of energy sublevels equals to its number . true or false

true

2. The d-block starts to appear from ……………. period.

4

11. Picometer is …………………………………….

part of million of the million part of a meter OR 1*10^-12

18. Each period ends by a non-metal element. true or false

false (noble gas)

24. Each period starts with strong metal. true or false

false ( all except 1A)

16. The water molecule is a polar compound, because the difference in electronegativity between its elements is relatively low . true or false

false (high)

22. Metalloids are found in d-block. true or false

false (p block)

10. ……………. Discovered the main energy levels of an atom.

Bohr

1. Elements of p-block are arranged in ……………… groups.

6

7. The period number of the elements equals the number of…………occupied by electrons in its atom.

energy levels

6. The modern periodic table consist of …………. horizontal periods and………… vertical columns.

7 Periods and 18 coulums

3. The elements which have the same properties are in the same………….in the periodic table.

group

23. It is difficult to know metalloids from their electronic configuration. true or false

true

17. The strongest non- metal in group (7A) is ……………

Fluorine (F9)

4. An element its atomic number is 18 is considered a …………….

inert gas

19. Lithium is the strongest metallic element in group 1A. true or false

false (cesium)

25. By increasing the atomic size in the same group, the metallic property decreases. true or false

false (increases)