What is atomic mass?

Question

What is atomic mass and how do u find the atomic mass of an element (example: hydrogen) ?

Answer 1

it is the weight of the atom, electrons have no weight
a proton weighs 1 and a nutron weighs 1
hydrogen weighs 1.0079

Answer 2

The mass of an atom, usually expressed in atomic mass units.

Mass does not necessarily relate to size, though there is enough of a loose correlation that more often than not, we can say that an item of very small size will have very small mass. And atoms are very, very small—so much so that, until the early twentieth century, chemists and physicists had no accurate means of isolating them to determine their mass.

The diameter of an atom is about 10−8 cm. This is equal to about 0.000000003937 in—or to put it another way, an inch is about as long as 250 million atoms lined up side by side. Obviously, special units are required for describing the size of atoms. Usually, measurements are provided in terms of the angstrom, equal to 10−10 m. (In other words, there are 10 million angstroms in a millimeter.)

Measuring the spatial dimensions of an atom, however, is not nearly as important for chemists' laboratory work as measuring its mass. The mass of an atom is almost inconceivably small. It takes about 5.0 · 1023 carbon atoms to equal just one gram in mass. At first, 1023 does not seem like such a huge number, until one considers that 106 is already a million, meaning that 1023 is a million times a million times a million times 100,000. If 5.0 · 1023 angstrom lengths—angstroms, not meters or even millimeters—were laid end to end, they would stretch from Earth to the Sun and back 107,765 times!

Or just look at a periodic table of elements. :)

Answer 3

Atomic mass or mass number (A), also called atomic mass number or nucleon number, is the number of protons and neutrons in an atomic nucleus.
The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol.[check the periodic table]

and this link might be useful , check it http://education.jlab.org/qa/pen_number.html

Answer 4

look in the periodic table of elements in back of your book it should say it there...remember to round it because then it will be rong

Answer 5

That would be George W. Bushs' brain.