Biology 101 - Chemistry Quiz

Compound to 31P, the radioactive isotope 32P has a. a different atomic number b. one more neutron c. one more proton d. one more electron e. a different charge

b. one more neutron

Which of these statements is true of all anionic atoms? a. the atom has more electrons than protons b. the atom has more protons than electrons c. the atom has fewer protons than does a neutral atom of the same element d. the atom has more neutrons than protons e. the net charge is minus 1

a. the atom has more electrons than protons

In the term trace element, the modifier trace means a. the element is required in very small amounts b. the element can be used as a label to trace atoms through an organism's metabolism. c. the element is very rare on Earth d. the element enhances health but is not essential for the organism's long-term survival. e. the element passes rapidly through the organism

a. the element is required in very small amounts

Atoms can be represented by simply listing the number of protons, neutrons, and electrons - for example, 2p+; 2n0; 2e- for helium. Which atom represents 18O isotope for oxygen? a. 6p+; 8n0; 6e- b. 8p+; 10n0; 8e- c. 9p+; 9n0; 9e- d. 7p+; 2n0; 9e- e. 10p+; 8n0; 1oe-

b. 8p+; 10n0; 8e-

An element is to a(n) ______ as a tissue is to a(n) ______. a. atom;organism b. compound;organ c. molecule; cell d. atom;organ e. compound;organelle

b. compound; organ

The reactivity of an atom arises from a. the average distance of the outermost electron shell from the nucleus b. the existence of unpaired electrons in the valence shell c. the sum of the potential energies of all the electron shell d. the potential energy of the valence shell e. the enerty difference between the s and p orbitals

b. the existence of unpaired electrons in the valence shell

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the electron configuration of sulfur, we can predict that the molecular formula of the compound will be a. HS b. HS2 c. H2S d. H3S2 e. H4S

c. H2S