Question

read each description in the first column of the table below. if any chemical element with atomic number of 92 or less matches the description, check yes and enter the chemical symbol of an element that matches. otherwise check no in the second column.

description	does any element with (zleq92) match the description?	if you checked yes, give the symbol of an element with (zleq92) that matches.
a nonmetal in group 7a.	yes no
an alkali metal with a higher atomic number than fluorine.	yes no
a main - group element in period 3.	yes no

Explanation:

Step1: Locate element in Period 5 and Group 2A

In the periodic - table, the element in Period 5 and Group 2A is strontium (Sr). So the answer for the first row is Yes and the symbol is Sr.

Step2: Identify non - metal in Group 7A

Group 7A elements are halogens, which are non - metals. Examples include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). All of these have atomic numbers less than 92. So the answer for the second row is Yes. A common example is Cl.

Step3: Find alkali metal with higher atomic number than fluorine

Alkali metals are in Group 1A. Lithium (Li, atomic number 3), sodium (Na, atomic number 11), potassium (K, atomic number 19), etc. are alkali metals. Since fluorine has an atomic number of 9, there are many alkali metals with higher atomic numbers. For example, sodium (Na). So the answer for the third row is Yes and the symbol can be Na.

Step4: Find main - group element in Period 3

Main - group elements are in Groups 1A - 8A. In Period 3, elements like sodium (Na), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar) are main - group elements. So the answer for the fourth row is Yes. A common example is Na.

Answer:

1. Yes, Sr
2. Yes, Cl
3. Yes, Na
4. Yes, Na