Question

question 3 (1 point)
which element is in group 18 and period 3?
neon (ne)
argon (ar)
xenon (xe)
krypton (kr)
question 4 (1 point)
which element is part of the halogens family?
argon (ar)
neon (ne)
krypton (kr)
iodine (i)
question 5 (1 point)
what group has the property of being semi - conductors?
transition metals
metalloids
halogens
alkali metals

Explanation:

• Question 3: In the periodic table, argon (Ar) is in Group 18 (noble - gases) and Period 3. Neon is in Period 2, xenon is in Period 5, and krypton is in Period 4.
• Question 4: The halogens family includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Argon, neon, and krypton are noble - gases.
• Question 5: Metalloids have properties intermediate between metals and non - metals, including semi - conductivity. Transition metals are good conductors, halogens are non - metals with different properties, and alkali metals are highly reactive metals.

Answer:

• Question 3: B. Argon (Ar)
• Question 4: D. Iodine (I)
• Question 5: B. Metalloids