Periodic Trends | MCQs

Explanation

Osmium is the densest naturally occurring element, with a density of approximately 22.59 g/cm³.

This makes it the highest density transition element, far exceeding the densities of elements like mercury and zinc.

Explanation

Explanation

• Atomic radius decreases along a period as you move from left to right.
• This is because the number of protons in the nucleus increases, which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.

Explanation

Elements of Group IVA (Group 14) like carbon (C) and silicon (Si) have very high melting points due to strong covalent bonding.

For example, diamond (carbon) has the highest melting point among all elements.

Explanation

Electronegativity:- Due to the increase in the number of protons electronegativity increases left to right in a period.

Explanation

• Strontium has the largest metallic radius with a value of 215 pm (picometers).
• This is due to its position in the periodic table, as it is a heavy alkaline earth metal with a large atomic radius.

Here are the atomic radii of the elements you've listed:

• Strontium (Sr): 215 pm
• Calcium (Ca): 197 pm
• Magnesium (Mg): 160 pm
• Beryllium (Be): 125 pm

Explanation

The difference of lithium from the other alkali metals is mainly because of small radius and high charge density.

Lithium has a smaller atomic radius compared to other alkali metals.

This resulting in a higher charge density that leads to stronger ionic interactions and unique chemical properties.