Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

Boron, which has an average atomic mass of 10.81 amu, has two stable isotopes: boron-10 (19.78%) and boron-11 (80.22%). Boron-10 has an atomic mass of 10.0129 amu; what is the atomic mass of boron-11?

What is the correct name for Ni(NO₂)₂?

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

In one sentence, describe the picture of the atom that emerged from the Rutherford-Geiger-Marsden experiment with alpha particles.

Elements in group 16 (VIA) are called ________

Which statement regarding the organization of the periodic table is not correct?

Copper(II) sulfate is a common fungicide. What is the correct formula for copper(II) sulfate?

A Cl atom has ________ protons, ________ neutrons, and ________ electrons.

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the heavier isotope is the more abundant one.

Who discovered electrons?

Which statement best describes isotopes?

What is the symbol of the ion having 17 protons and 18 electrons?

An unknown element is found to contain isotopes with the following masses and natural abundances: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%). Using these data, identify the element.

What is the correct symbol for a proton?

Write the complete atomic symbol with both a superscript and a subscript for a sodium ion that contains 11 protons, 10 electrons, and 12 neutrons.

Which element labeled A-E in the periodic table below will have an ionic charge of +2?

Name the following oxides of nitrogen in this sequence: NO, N₂O, NO₂, N₂O₄.

Silicon is best described as a ________

Identify the letter of the group that contains the most nonmetals.

Iron is best described as a(n) ________