Question

fill in the chart below. the first row has been completed as an example.

element	symbol	atomic number	period	group
krypton	o
		79
			4	7

give an atom with the following characteristics.
a halogen
b chalcogen
c alkali metal
d actinide series
e lanthanide series
f alkaline earth metal
g transition metal
h nobel gas

Explanation:

Step1: Recall element properties

Use periodic - table knowledge.

Step2: Fill the table for Krypton

Krypton has symbol Kr, atomic number 36, is in period 4, and group 18.

Step3: Provide examples for each category

a. A halogen is Fluorine (F).
b. A chalcogen is Oxygen (O).
c. An alkali metal is Lithium (Li).
d. An actinide series element is Uranium (U).
e. A lanthanide series element is Cerium (Ce).
f. An alkaline - earth metal is Calcium (Ca).
g. A transition metal is Iron (Fe).
h. A noble gas is Helium (He).

Element	Symbol	Atomic Number	Period	Group

Answer:

a. Fluorine (F)
b. Oxygen (O)
c. Lithium (Li)
d. Uranium (U)
e. Cerium (Ce)
f. Calcium (Ca)
g. Iron (Fe)
h. Helium (He)