question 1. which list of elements contains a metal, a metalloid, and a nonmetal? potassium (k), sodium…

question 1. which list of elements contains a metal, a metalloid, and a nonmetal? potassium (k), sodium (na), and chlorine (cl). magnesium (mg), bromine (br), and helium (he). sodium (na), boron (b), and oxygen (o). nitrogen (n), carbon (c), and phosphorus (p).

question 1. which list of elements contains a metal, a metalloid, and a nonmetal? potassium (k), sodium (na), and chlorine (cl). magnesium (mg), bromine (br), and helium (he). sodium (na), boron (b), and oxygen (o). nitrogen (n), carbon (c), and phosphorus (p).

Answer

Explanation:

Step1: Recall element types

Metals are on the left - side and bottom of the periodic table, metalloids are along the staircase - like diagonal, and nonmetals are on the right - side.

Step2: Analyze each option

  • Option 1: Potassium (K) and sodium (Na) are metals, chlorine (Cl) is a nonmetal. No metalloid.
  • Option 2: Magnesium (Mg) is a metal, bromine (Br) and helium (He) are nonmetals. No metalloid.
  • Option 3: Sodium (Na) is a metal, boron (B) is a metalloid, oxygen (O) is a nonmetal.
  • Option 4: Nitrogen (N), carbon (C), and phosphorus (P) are nonmetals. No metal or metalloid.

Answer:

Sodium (Na), boron (B), and oxygen (O).