The atomic mass of an element includes the masses of all 3 subatomic particles of neutrons, protons and electrons.
Atomic Mass
Atomic Mass Example 1
On the Periodic Table, the atomic mass is represented by the number with decimal places.
Which of the following choices has the greatest atomic mass?
Atomic Mass
Atomic Mass Example 2
Atomic Mass
Atomic Mass Example 3
Only three isotopes of magnesium exist on earth. 24Mg is the most common form at 78.70% natural abundance with a mass of 23.98504 amu, 25Mg has a 10.13% natural abundance, while 26Mg has a natural abundance of 11.17% and a mass of 25.98259 amu. What is the mass of the 25Mg isotope?
Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?
- The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (N...
- The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv...
- What is the atomic weight of an element that consists of two naturally occurring isotopes? The first isotope h...
- (a) What isotope is used as the standard in establishing the atomic mass scale?
- (b) Why is the atomic weight of carbon reported as 12.011 in the table of elements and the periodic table in t...
- Iron has three major isotopes: 54Fe (atomic mass = 53.9396 u; abundance 5.85%), 56Fe (atomic mass = 55.9349 u;...
- Bromine has two naturally occurring isotopes, bromine-79 1atomic mass = 78.9183 u; abundance = 50.69%2 a n d b...
- An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance...
- An element has four naturally occurring isotopes with the masses and natural abundances given here. Find the a...
- Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass ...
- Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass ...
- Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The mass and natural abundance of Si...
- The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the exten...
- The element chromium (Cr) consists of four naturally occurring isotopes with atomic masses 49.9460, 51.9405, ...
- Copper (Cu) consists of two naturally occurring isotopes with masses of 62.9296 and 64.9278 u. (a) How many pr...
- What is the difference between an element’s atomic number and its atomic weight?
- There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 ...
- Iodine has a lower atomic mass than tellurium (126.90 for iodine, 127.60 for tellurium) even though it has a h...
- Naturally occurring iodine has an atomic mass of 126.9045 amu. A 12.3849 g sample of iodine is accidentally co...
- The unified atomic mass unit (u) 1/12 the mass of a neutral atom of: (a) 1^H (b) 12^C (c) 14^C (d) 16^O
- (a) The unified atomic mass unit (u) is used to represent the extremely small mass of atoms. How many grams ar...
- Boron has only two naturally occurring isotopes. The mass of boron-10 is 10.01294 amu and the mass of boron-11...
- Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 amu and the mass of lithiu...
- Naturally occurring boron consists of two isotopes: 10^B (19.9%) with an isotopic mass of 10.0129 and 11^B (80...
- Naturally occurring silver consists of two isotopes: 107^Ag (51.84%) with an isotopic mass of 106.9051 and 109...
- Magnesium has three naturally occurring isotopes: 24^Mg (23.985) with 78.99% abundance, 25^Mg (24.986) with 10...
- Naturally occurring chlorine is composed of two isotopes: 75.76% Cl-35 (mass 34.9688 amu) and 24.24% Cl-37 (ma...
- A sample of naturally occurring silicon consists of 28^Si (27.9769), 29^Si (28.9765), and 30^Si (29.9738). If ...
- Silver is composed of two naturally occurring isotopes: Ag-107 (51.839%) and Ag-109. The ratio of the masses o...
- Copper metal has two naturally occurring isotopes: copper-63 (69.15%; isotopic mass = 62.93) and copper-65 (30...
- Germanium has five naturally occurring isotopes: 70^Ge, 20.5%, 69.924; 72^Ge, 27.4%, 71.922; 73^Ge, 7.8%, 72.9...
- Prior to 1961, the atomic mass unit (amu) was defined as 1/16 the mass of the atomic weight of oxygen; that is...