Share Graduation of Elements properties - Lesson 2
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1. Elements of p-block are arranged in ……………… groups.
6
2. The d-block starts to appear from ……………. period.
4
3. The elements which have the same properties are in the same………….in the periodic table.
group
4. An element its atomic number is 18 is considered a …………….
inert gas
5. ………………. indicates the number of electrons that revolve in energy levels
atomic number
6. The modern periodic table consist of …………. horizontal periods and………… vertical columns.
7 Periods and 18 coulums
7. The period number of the elements equals the number of…………occupied by electrons in its atom.
energy levels
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
10. ……………. Discovered the main energy levels of an atom.
Bohr
11. Picometer is …………………………………….
part of million of the million part of a meter OR 1*10^-12
12. The atomic size …………. in the same group by …………. The atomic number.
increases , increasing
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
14. The difference in electronegativity of two elements can form …………,.………………, and………………….
polar compound , non-polar compound , ionic compound
15. A covalent polar compound that has lower polarity than water and has three single covalent bonds is known as …………….
ammonia NH3
16. The water molecule is a polar compound, because the difference in electronegativity between its elements is relatively low . true or false
false (high)
