Question

1. name an atom with the following characteristics. a. halogen b. nonmetal c. alkali metal d. metalloid e. lanthanide series f. alkaline earth metal g. transition metal h. nobel gas

Explanation:

a. Chlorine (Cl) is a halogen as it is in Group 17 of the periodic table.
b. Oxygen (O) is a non - metal as it lacks metallic properties like conductivity and malleability.
c. Sodium (Na) is an alkali metal as it is in Group 1 of the periodic table.
d. Silicon (Si) is a metalloid as it has properties intermediate between metals and non - metals.
e. Cerium (Ce) is part of the lanthanide series which is in the f - block of the periodic table.
f. Calcium (Ca) is an alkaline earth metal as it is in Group 2 of the periodic table.
g. Iron (Fe) is a transition metal as it is in the d - block of the periodic table.
h. Helium (He) is a noble gas as it is in Group 18 of the periodic table and is very stable with a full outer electron shell.

Answer:

a. Chlorine (Cl)
b. Oxygen (O)
c. Sodium (Na)
d. Silicon (Si)
e. Cerium (Ce)
f. Calcium (Ca)
g. Iron (Fe)
h. Helium (He)