Atomic Mass

Iodine is a non meta element. Atomic mass of it is 127.6.

they increase by one going from left to right

totally a guess

36 The answer of this question is there are 30 protons and 35 neutrons

There is no element called 'flouorine', however there is one called fluorine. What is it's atomic mass? It depends how accurate you want the answer, for most of us 19.0 is accurate enough.

Mike Slater

19.0 is inappropriate, given that .0 is a significant figure and will be assumed to be correct. 19 would be more appropriate, and 18.998 would be more accurate.

The Atomic Mass of an element is the numerical average of all the masses of the naturally occurring isotopes of that element proportionately. Man made elements do not count in supposedly.

IE: If we have an element with atomic weight 100 and we have an isotope of that element with atomic weight 102 and if they occurred equally in nature then the Atomic Mass would be 101.

If the atomic mass of water is 18 and the atomic mass of hydrogen is 1 then the atomic mass of oxygen is 16

Sulfur- Element Number 16 on the Periodic Table of Elements

42

because

The atomic number of calcium is 20. The atomic number stands for the number of protons in an element. It is represented by the letter Z.

There isn't one, but there is an element with the atomic mass of 200.59 and that is Hg for mercury with an atomic of 80.

that's easy.

32 neutrons means that the mass of protons is 25 (as is the electrons) so all i have to do is look for the right one.

simlpy thinking there are 2e (2 electrons on te inner shell) ten each one afterwards has up 8e unless there are no more electrons to fill the shell.

in this case its like this:

2e, 8e, 8e, 7e.

the element is infact manganese in group 5 (Mn).

magnese will react with anything from group one easily at a 1:1 basis and will react with anything from group 2 at a 2:1 basis (the 2 representing magnese).

PlutOnium 239 is an element - plutOnium - with an atomic weight of 239.

Name: Boron
Symbol: B
Atomic Number: 5
Atomic Mass: 10.811 amu
Melting Point: 2300.0 °C (2573.15 K, 4172.0 °F)
Boiling Point: 2550.0 °C (2823.15 K, 4622.0 °F)
Number of Protons/Electrons: 5
Number of Neutrons: 6
Classification: Metalloid
Crystal Structure: Rhombohedral
Density @ 293 K: 2.34 g/cm3
Color: brownish

density=mass/volume

1mL=1cm^3, so 30.0 mL=30.0 cm^3

then you divided the volume 30.0 by the mass 81.0 grams is euqal to 81.0 grams/30.0 cm^3=2.7 g/cm^3(that's the units)

An atomic mass unit, also known as AMU, is the unit used to measure the weight of protons and neutrons. If an element has an atomic mass of 84 AMU, that element has a total of 84 protons and neutrons in its nucleus.

The atomic mass unit is approximately the mass of one neutron or proton. An electron has a mass of approximately 1/2000 of an amu.

90.7 amu

One mole of atoms of an element is equal to the atomic mass of that element expressed in grams.

Nitrogen-14

so one mole of nitrogen weighs 14 g

Daltons experiments with gases also led him to form two more chemical laws, the Law of Partial Pressures (behaviour of gaseous mixtures and dissolving of gases into liquids) and the Law of Multiple Proportions (ratios and gas composition). It is needless to say that without Dalton's work and consequent theories, Chemistry as we know it today may not exist.

If you mean "how does one determine an atoms atomic mass?", then the answer would be to find a periodic table of elements where the whole numbers indicate atomic number and the other indicating atomic mass. Atomic number is generally described as the number of protons in a naturally occurring atom of a given element, and the atomic mass is the number of protons + number of neutrons in an atom.

The atomic number of krypton is 36, and its atomic weight from the periodic table is 83.798.

Refer to the related links for a printable periodic table.