According to Newlands law of octaves, which of the following elements have same properties?

Correct option is A

The correct answer is:(A) Be and Mg.

According to Newlands' Law of Octaves, when elements are arranged in increasing order of their atomic masses, every eighth element exhibits similar properties to the first one, much like the eighth note in a musical scale.

This pattern was first observed by John Newlands in 1865.

• Be (Beryllium) and Mg (Magnesium) both belong to Group 2 of the periodic table, and they exhibit similar properties, such as the ability to form basic oxides, similar atomic and ionic radii, and similar chemical reactivity.
• These elements appear to follow the Law of Octaves, as their properties are similar and repeat in a periodic fashion.

Information booster:

 K and Co (Potassium and Cobalt): 

• Potassium (K) and Cobalt (Co) are not placed at the same interval in the periodic table.
• They belong to different groups and have very different chemical properties. Potassium is an alkali metal, while Cobalt is a transition metal.

 Na and Cl (Sodium and Chlorine): 

• Sodium (Na) and Chlorine (Cl) have very different properties. Sodium is an alkali metal (Group 1), while Chlorine is a halogen (Group 17).
• They do not exhibit similar properties as per the Law of Octaves.

 B and Si (Boron and Silicon):

•  Boron (B) and Silicon (Si) are both semiconductors and share some similarities, but they do not follow the Law of Octaves, as they are not at positions that would repeat their properties in a periodic manner according to the octet rule.
• They belong to different groups in the periodic table and have different properties.