2. Atoms & Elements

Which term is defined as the sum of protons and neutrons in an atom?

An atom has 20 electrons and 20 neutrons. What is the atomic mass of this atom if it also has 20 protons?

How many protons are present in the isotope lithium-7?

Which of the following is closest to the atomic mass of phosphorus (P)?

Which of the following is closest to the atomic mass of nickel (Ni)?

Which of the following is closest to the atomic mass of a magnesium (Mg) atom?

Which of the following is the atomic mass of cobalt (Co)?

Which number determines the arrangement of elements in the modern periodic table?

Which of the following elements has the greatest average atomic mass?

Which of the following numerical setups can be used to calculate the atomic mass of silver, given that silver has two naturally occurring isotopes: Ag-107 (abundance: 51.8%, mass: 106.905 amu) and Ag-109 (abundance: 48.2%, mass: 108.905 amu)?

Which unit is commonly used for measuring atomic mass?

An atom of lithium has 3 protons and 4 neutrons. What is the atomic mass of this lithium atom?

Which of the following is closest to the atomic mass of lead (Pb)?

Given the periodic table box for carbon below, which value represents the atomic mass?C612.01

Knowing the atomic mass of an element allows inferences about which of the following?