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Chapter 2: Problem 41

For each of the following elements, write its chemical symbol, locate it in the periodic table, give its atomic number, and indicate whether it is a metal, metalloid, or nonmetal: (a) chromium, (b) helium, (c) phosphorus, (d) zinc, (e) magnesium, (f) bromine, (g) arsenic.

Short Answer

Expert verified
(a) Chromium: Cr, Group 6, Period 4, Atomic number 24, Metal. (b) Helium: He, Group 18, Period 1, Atomic number 2, Nonmetal (noble gas). (c) Phosphorus: P, Group 15, Period 3, Atomic number 15, Nonmetal. (d) Zinc: Zn, Group 12, Period 4, Atomic number 30, Metal. (e) Magnesium: Mg, Group 2, Period 3, Atomic number 12, Metal (alkaline earth metal). (f) Bromine: Br, Group 17, Period 4, Atomic number 35, Nonmetal (halogen). (g) Arsenic: As, Group 15, Period 4, Atomic number 33, Metalloid.

Step by step solution

01

(a) Chromium

- Chemical symbol: Cr - Located in the periodic table: Group 6, Period 4 - Atomic number: 24 - Classification: Metal
02

(b) Helium

- Chemical symbol: He - Located in the periodic table: Group 18, Period 1 - Atomic number: 2 - Classification: Nonmetal (noble gas)
03

(c) Phosphorus

- Chemical symbol: P - Located in the periodic table: Group 15, Period 3 - Atomic number: 15 - Classification: Nonmetal
04

(d) Zinc

- Chemical symbol: Zn - Located in the periodic table: Group 12, Period 4 - Atomic number: 30 - Classification: Metal
05

(e) Magnesium

- Chemical symbol: Mg - Located in the periodic table: Group 2, Period 3 - Atomic number: 12 - Classification: Metal (alkaline earth metal)
06

(f) Bromine

- Chemical symbol: Br - Located in the periodic table: Group 17, Period 4 - Atomic number: 35 - Classification: Nonmetal (halogen)
07

(g) Arsenic

- Chemical symbol: As - Located in the periodic table: Group 15, Period 4 - Atomic number: 33 - Classification: Metalloid

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Most popular questions from this chapter

Using the periodic table, predict the charges of the ions of the following elements: (a) Ga, (b) Sr, (c) As, (d) Br, (e) Se.

(a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic weight of boron is reported as 10.81 , yet no atom of boron has the mass of 10.81 amu. Explain.

There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br_{2} \text molecules, and the mass of a Br \(_{2}\) molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br_{2} consists of three peaks:(a) What is the origin of each peak (of what isotopes does each consist)? (b) What is the mass of each isotope? (c) Determine the average molecular mass of a Br_ molecule. (d) Determine the average atomic mass of a bromine atom. (e) Calculate the abundances of the two isotopes.

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