Atomic Mass

The atomic mass of potassium, approximately 39.1 atomic mass units, reflects the average mass of its naturally occurring isotopes and influences its chemical properties. This mass, along with its position in Group 1 of the periodic table, indicates that potassium is a highly reactive alkali metal, which readily loses one electron to form positive ions. The relatively low atomic mass contributes to its low density and high reactivity, particularly with water, producing potassium hydroxide and hydrogen gas. Thus, atomic mass plays a crucial role in determining potassium's behavior in chemical reactions.

The element that fits your description is bromine (Br). It is a liquid non-metal at room temperature, has the same number of energy levels (4) as calcium (Ca), has fewer valence electrons (7) than the noble gases, and its atomic mass (approximately 79.9) is greater than that of selenium (Se), which has an atomic mass of about 78.9.

The assumptions for using a weighted average include: 1) the weights assigned to each value are accurate and meaningful, 2) all values being averaged are measured on the same scale, 3) the weights represent the relative importance of each value, and 4) the values being averaged are relevant to the calculation being performed.

The atomic mass of an element is equal to the number of protons.

Decade is C10H22 so it would be 10(12.01) + 22(1.01) = 142.32 g / mol

The atomic mass of a starch molecule is calculated by adding up the atomic masses of all the atoms it contains. Since starch is composed of carbon, hydrogen, and oxygen atoms, the atomic mass can vary depending on the specific ratio of these atoms in the molecule. The average molecular weight of starch is around 162 grams per mole.

To calculate the atomic mass of thallium, you need to consider the weighted average of the isotopes of thallium found in nature, based on their abundance. You multiply the mass of each isotope by its relative abundance, then sum these values to get the atomic mass. The atomic mass of thallium is approximately 204.38 grams per mole.

Silver: symbol Ag, atomic number 47 and atomic weight/mass 107.880

Because most naturally occurring elements are a mixture of isotopes, each having a different atomic mass. These individual isotopic atomic masses must be combined accounting for the amount of each isotope of the element is present to get a weighted average atomic mass.

in 1869 by Dmitri Mendeleev

This mass is 5,323 grams.

The elements on the periodic table are arranged in order of increasing atomic number.

The atomic mass of oxygen-15 is 15. The atomic mass consists of protons and neutons, and oxygen-15 has 8 protons and 7 neutrons.

Mass madness is group hysteria where a large group has an uncontrollable outburst of emotions or fear, usually irrationally. Some instances include: the Salem Witch Trials when the community believed people were witches and hunted them down and executed them; the Holocaust when the Nazis executed Jews; the Nigerian Genitalia Vanishing Epidemic of 1990; the anthrax and SARS scares after 9/11; thoughts of the world ending after 1999 and now in 2012; cults; etc.

The percentage of each isotope is different.

yes

We get the number of neutrons.

Atomic number is the number of protons, and atomic mass is protons plus neutrons.

The mass of an electron is atomic mass units is 5,485 799 090 70(16); the mass of the electron is not an atomic mass.

CH4Answer this question…

it depends because isotopes have different nucleon numbers but their atomic number stays the same.

The standard atomic weight of polonium is [210], after IUPAC rules.

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

The atomic mass of the element Mercury is 200.59 amu.

Nitrous Oxide is not an element, therefore it doesn't have atomic mass. An element is a substance in the form of solid, liquid, gas or metalloid, which can not be broken down anymore. For example, Tin is not an element because it is made up of different elements. Oxygen is just oxygen it is not made out of anything but oxygen atoms. :) BTW I'm a 8th grader that learned this is Science class and made a 102 on the test of the periodic table, elements and the atoms that make them up.