Atomic Mass

The atomic mass for cerium is approximately 140.12 atomic mass units.

They show that the periodic table isn't arranged on the basis of increasing atomic mass because iodine has a mass lesser than tellurium. Iodine has a mass of 126.90 and tellurium has a mass of 127.60.

in russia

According to an Answers.com search for "Gustav Kirchhoff", the spectroscope was invented in Germany.

Ooooh, SO close..... Tungsten has an average atomic mass of 183.84, accordng to Webelements.com.

Well, to be precise, no atom has a fractional atomic mass; the fractional numbers are based on proportions of atoms with 74 protons and some varying number of neutrons from 106 to 112 neutrons. The most prevalent numbers are 110, 112, and 108 neutrons, in that order.

When they are of the same element.

Suren the answer be chlorine? Atomic chlorine?

The element with an atomic number of 51 is Sb - Antimony; atomic weight = 121.75.

Addition of number of protons and neutrons.Mass of Electrons is neglected.

The atomic mass of hydroxide (rounding) is 17.008 atomic mass of oxygen 16.00 + atomic mass of hydrogen 1.008

When the number of neutrons changes, the atomic mass will change.

because it's an average of various isotopes, in proportion in which they exist in nature

Indium (In) has an atomic mass of 114.818g/mol

Magnesium is a meta element. Atomic mass of it is 24.

The metal cautions easily slide past one another.

Bismuth Bi and polonium Po both have an average atomic mass of 209 amu

The atomic number of magnesium is 12 and the mass number is 24.305

use the Periodic Table it gives you all the info you need :D

There are multiple elements of the Periodic Table which have 4 isotopes. These are further broken down into three which have unstable isotopes, and 6 that do not decay. The 6 that are stable are strontium (Sr), lead (Pb), cerium (Ce), iron (Fe), chromium (Cr) and sulphur (S).

Hydrogen is a non meta element. Atomic mass of it is 2.

The stratosphere is the second layer of Earth's atmosphere and contains 15% of the mass found in Earth's atmosphere. The ozone can be found in the stratosphere. What you won't find there are planes and clouds.

atomic number is the amount of protons, equal to the atomic number, the electrons, minus the mass number atomic number is the amount of protons, equal to the atomic number, the electrons, minus the mass number atomic number is the amount of protons, equal to the atomic number, the electrons, minus the mass number

sodium has more protons and neutrons. electrons have practically no mass, valence electrons are just outer orbital electrons. sodium has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has 10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The neon atom has 10 protons and 10 neutrons for a mass number of 20. The sodium atom has 11 protons and 12 neutrons for a mass number of 23. The number of valence electrons has no bearing on mass number or atomic weight.

At room temperature, the density of cadmium is 8.65  g/cc.

That particle is the proton.

Helium with an atomic mass of 4.00260