Question

Arrange the following elements in increasing order of their atomic number:
A. Zr
B. Xe
C. Ag
D. Ba
E. Rb

• A. A, B, E, C, D
• B. E, C, A, D, B
• C. E, A, C, B, D
• D. A, B, C, D, E

Hint:

Having a general idea of the layout of the periodic table can help you quickly estimate the order of atomic numbers without knowing them exactly. All these elements are in periods 4 and 5, increasing from left to right.

Answer 1

The Correct Option is C

Step 1: Identify the atomic number (Z) for each element.
- E. Rb (Rubidium): Z = 37
- A. Zr (Zirconium): Z = 40
- C. Ag (Silver): Z = 47
- B. Xe (Xenon): Z = 54
- D. Ba (Barium): Z = 56

Step 2: Order the elements by increasing Z.
The sequence is: Rb (37)<Zr (40)<Ag (47)<Xe (54)<Ba (56).

Step 3: Associate the element order with the letter code.
The corresponding letter sequence is E, A, C, B, D.