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CHEM0405010
Given that the proton number of element W, X, Y and Z are 11, 15, 17and 19 respectively. Arrange the atoms in descending order of their diameter.
CHEM0405020
The properties of the element in a period of a periodic table will change when crossing from left to right. Which of the following shows the change correctly?
CHEM0405030
Elements A, B and C are in the same period in the periodic table. The table below shows the characteristic of the oxide of A, B and C.
Oxide | Characteristic |
Oxide A | Acidic |
Oxide B | Basic |
Oxide C | Amphoteric |
Which of the following arrangement of A, B and C in ascending order of their proton number.
CHEM0405040
Which of the following are the properties of transition metal?
CHEM0405050
Which of the following statements are true about transition metal?
CHEM0405060
The atomic radius of elements in period 3 decreases across the period from left to right. This is because
CHEM0405070
Element | Electron Arrangement |
P | 2.8.4 |
Q | 2.8.2 |
R | 2.8.8 |
S | 2.8.6 |
The table above shows that the arrangement of the electrons of 4 elements P, Q, R and S. Which element is metal?