18. Which three elements are likely to have similar chemical and physical proper

Question

18. Which three elements are likely to have similar chemical and physical properties? a. sodium, lithium, and potassium b. sodium, magnesium, and aluminum e. nitrogen, oxygen, and neon d. nickel, copper, and zinc 19. Which grouping of elements is composed entirely of metalloids? a. B, As, and Sb b. Si, P, and Ge e. As, Ge, and Pb d. In, Sn, and Ge 20. What halogen is located in the fourth period? a. Se b. Kr c. Cl d.Br Thank you & Good weekend! The periodic table is attached in the next page

Explanation / Answer

18. a. Sodium, lithium and potassium are the alkali metals. They belong to same group and have same electronic configuration.
Hence, they have similar physical and chemical properties. The elements in options b, c and d belong to different groups.
Hence, they have different physical and chemical properties. Thus, option a is correct and options b,c and d are incorrect.
19. a. B,As and Sb are metalloids. Thus, option a is correct and options b,c and d are incorrect.
Si , N and P are non metals. Bi, Ge , Sn, Pb and In are metals.
20.d. Bromine (Z= 35) is located in fourth period.
Se (Z=34) belongs to fourth period but it is not a halogen.
Kr (36) belongs to fourth period but it is not a halogen. It is a noble gas.
Cl(Z=17) belongs to third group. It is a halogen.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.