Group

• Group 1: alkali metals, or lithium family.
• Group 2: alkaline earth metals, or beryllium family.
• Group 3: the scandium family.
• Group 4: the titanium family.
• Group 5: the vanadium family.
• Group 6: the chromium family.
• Group 7: the manganese family.
• Group 8: the iron family.

The noble gases are a group of chemical elements that make up Group 18 on the periodic table. These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.

Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the electronegativity, the more strongly that element attracts the shared electrons….Periodic Trends — Electronegativity.

Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

The reason for them being inert is that all of their shells are completely filled. Inert gases have ns2 np6 configuration which shows that they have 8 electrons in their valence shell.

The foods highest in iodine include seaweed, dairy, tuna, shrimp and eggs. Additionally, most table salt has been iodized, providing an easy way to add iodine to your meals.

An iodine deficiency can cause uncomfortable and even severe symptoms. They include swelling in the neck, pregnancy-related issues, weight gain and learning difficulties. Its symptoms are very similar to those of hypothyroidism, or low thyroid hormones.