Unit 1 - Lesson 2: Graduation of Properties of Elements in the Modern Periodic Table

1
It is the ability of the atom in covalent molecule to attract the electrons of the chemical bond towards itself.
2
It is an atom of a metallic element which lost one electron or more during the chemical reaction.
3
It is an atom of nonmetallic element which gained an electron or more during the chemical reaction.
4
It is a covalent compound, in which the difference in electronegativity between its elements is relatively high
5
They are the elements, which have less than four electrons in their outermost energy levels.
6
They are the elements, which have more than four electrons in their outermost energy levels.
7
It is a series in which metals are arranged in a descending order according to their chemical activity.
8
They are the elements, which have the properties of both metals and nonmetals.
9
The atomic radius is used as a measurement of the atomic size of the atom and its measuring unit is..........
10
In periods, by increasing the atomic number, the.........
11
During the chemical reactions, metal atoms tend to............
12
An element (X), whose atomic number is 13 so, the number of electrons in its lon is..........
13
Each period in the periodic table starts with.........
14
By increasing the atomic number within the period, the...........
15
By increasing the atomic number within group (1A), the .........
16
......... is the least metallic element in group (1A).
17
Metal oxides (as sodium oxide) are........ oxides.
18
All of the following metals react with water except........
19
Which of the following elements reacts with dilute hydrochloric acid ?...........
20
The 3rd period starts with elements whose oxides are as the following........

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