Question

Give the symbol of the element described by each of the following:
a. the alkaline earth metal in Period $2$
b. Group$\left(15\right)$ , Period $3$
c. the noble gas in Period $4$
d. the halogen in Period $5$
e. Group $4A\left(14\right)$ , Period $4$

Short answer

(a)The alkaline earth metal in period $2$is $Be$; Berrylium.

(b)The element is $P$; Phosphorous.

(c)The noble gas in period $4$is $Kr$; Krypton.

(d)The halogen in period $5$is $I$; Iodine.

(e)The element is $Ge$; Germanium.

Step-by-step solution

Part(a) Step1 : Given information.

We have been given that,

Period$=2$

We need to find the alkaline earth metal in given period number.

Part(a) Step2 : Simplify.

The alkaline earth metal in period $2$is $Be$;Berrylium.

Part(b) Step1 : Given information.

We have been given that,

Group$=15$, Period $=3$

We need to find the element with given group and period number.

Part(b) Step2 : Simplify.

The element with group $15$and period $3$is $P$; Phosphorous.

Essential for bones, teeth.

Part(c) Step1 : Given information.

We have been given that,

Period $=4$

We need to find the noble gas in period$4$.

Part(c) Step2 : Simplify.

The noble gas in period $4$is $Kr$; Krypton.

Used in certain electric and in flashlamp.

Part(d) Step1 : Given information.

We have been given that,

Period $=5$

We need to find the halogen in period$5$.

Part(d) Step2 : Simplify.

The halogen in period $5$is $I$; Iodine.

Least reactive halogens and most electropositive.

Part(e) Step1 :Given information.

We have been given that,

Group$=14$, Period$=4$

We need to find the element with given group and period number.

Part(e) Step2 : Simplify.

The element with group $14$and period $4$is $Ge$; Germanium.