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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
What is the number of atomic mass in a atom?
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.
What is the atomic mass of an element equal to atomic number or number of protons?
Answer:
The atomic mass is NOT equal to both 'atomic number' and 'number of protons .
The atomic mass of an element is by approximation equalto, but not exactly, the sum of protons and neutrons in the nucleus of the atom.
The number of protons is given by the atomic number, not atomic mass.
So, only the atomic number of an element AND the number of protons are equal. The atomic mass is also depending on the number of neutrons.
More explicative:
The atomic mass of an element refers to a particular isotope of that element, and is equal to the sum of the protons and neutrons in the nucleus of atoms of that isotope.
For example, carbon-12 atoms have 6 protons and 6 neutrons, while carbon-14 atoms have 6 protons and 8 neutrons.
Atomic weight, which is shown on the Periodic Table is a weighted average of the atomic masses of all the different isotopes of each element.
For example, the atomic mass of C-12 is 12.0000 a.m.u. and the atomic mass of Carbon is 12.0107(8) g/mol
From the Periodic Table you can only tell the number of protons in the atoms of all of the isotopes of a given element, because the number of protons defines the element, and is the element's atomic number. However, you cannot tell the number of neutrons from the Periodic Table. You would have to look up the atomic masses of all the isotopes of each element in some sort of reference. The atomic number of an element is equal to the number of protons in the nucleus of an atom.
To find the number of moles in 6.22 micrograms of Uranium, you first need to calculate the number of moles using the formula: Moles = Mass / Molar mass. The molar mass of Uranium is 238.0 g/mol. Convert 6.22 micrograms to grams by dividing by 1,000,000. Then, divide the mass in grams by the molar mass to find the number of moles.
Tungsten is a metal element. Atomic mass of it is 184.
Krypton is a non metal element. Atomic mass of it is 84.
What is gram atomic mass of sulfur?
The gram atomic mass of sulfur is 32.1 grams per mole. This value is calculated based on the atomic weight of sulfur, which is 32.06 g/mol.
Since the atom is electrically neutral, the number of electrons must be the same as the number of protons in the atom, which is the definition of atomic number. Therefore, there are 9 electrons.
Answer #1 The Atomic Mass for Flourine (F) is 18.9
Answer #2 If by F you mean fluoride you can find the atomic mass on any periodic table, which is 18.993
What is the atomic mass of element f?
The atomic mass of an element is the weighted average mass of its isotopes. To determine the atomic mass of element F, you would need to know the abundance of each isotope and its individual atomic mass, and then calculate the weighted average based on those values.
If the atomic number is 79 and atomic mass is 179.?
Z is atomic number
A is atomic mass
N is number of neutrons
Z=A-N
79 = 179 - N
179-79=100
so number of neutrons is equal to 100
This is one thing you can get from that given.
The true statements are A and B. Statement A is called Avogadro's number and represents the number of particles in one mole. Statement B refers to the molar mass, which is the mass of 1 mole of a substance expressed in grams, and is numerically equal to the atomic mass in atomic mass units (amu).
What is the atomic mass of dubnium?
The atomic mass of dubnium (Db) is approximately 268. It is a synthetic element with an atomic number of 105.
What is the atomic number and the atomic mass of lithium?
Hydrogen has 1 as its atomic number. That's because it has one proton in its nucleus. Hydrogen has three isotopes. Each isotope has one proton in its nucleus (naturally, because that's what makes it hydrogen). Atomic mass is the number of protons plus the number of neutrons in an atom's nucleus. Let's look at each isotope of hydrogen. "Simple" hydrogen has only the 1 proton in its nucleus. It's atomic number is 1 and its mass number is 1 (the 1 proton plus zero neutrons). Heavy hydrogen has 1 proton and 1 neutron in its nucleus. It's atomic number is 1 and its mass number is 2 (the 1 proton plus 1 neutron). Heavy, heavy hydrogen has 1 proton and 2 neutrons in its nucleus. It's atomic number is 1 and its mass number is 3 (the 1 proton plus 2 neutrons).
What is the atomic mass of Hydrogen Nitrogen and oxygen?
The atomic mass of hydrogen is approximately 1 atomic mass unit, the atomic mass of nitrogen is approximately 14 atomic mass units, and the atomic mass of oxygen is approximately 16 atomic mass units.
Which has the lower atomic mass cobalt or nickel?
Cobalt has an atomic mass of 58.933195(5) while nickel has an atomic mass of 58.6934(4). Nickel has the lower atomic mass.
Atomic mass for the first 30 elements?
Hydrogen - H - 1 - 1
Helium - He - 2 - 4
Lithium - Li - 3 - 7
Berelium - Be - 4 - 9
Boron - B - 5 - 11
Carbon - C - 6 - 12
Nitrogen - N - 7 - 14
Oxygen - O - 8 - 16
Fluorine - F - 9 - 19
Neon - Ne - 10 - 21
Sodium - Na - 11 - 23
Magnesium - Mg - 12 - 24
Aluminium - Al - 13 - 27
Silicon - Si - 14 - 28
Phosphorous - P - 15 - 31
Sulfur - S - 16 - 32
Chlorine - Cl - 17 - 35.5
Argon - Ag - 18 - 36
Potassium - K - 19 - 39
Calcium - Ca - 20 - 40
Scandium - Sc - 21 - 45
Vanadium - Vn - 22 - 48
Titanium - Ti - 23 - 51
Vanadium - Vn - 24 - 52
Manganese - Mn - 25 - 55
Iron - Fe - 26 - 56
Cobalt - Co - 27 - 59
Nickle - Ni - 28 - 59
Copper - Cu - 29 - 64
Zinc - Zn - 30 - 65
How much is the atomic mass and atomic number for corbon?
Carbon is a chemical element with an atomic number of 6 and an atomic mass of about 12.011 atomic mass units.
What element is for times the atomic mass of helium?
Well, two times four is eight, which would be oxygen.
Why is the atomic mass of elements on the periodic table rarely a whole number?
The mass number is the sum between the number of protons and the number of neutrons in the nucleus of an isotope. The mass number is always a whole number.
You are probably getting confused between mass number, atomic weight and atomic number.
But if you think to atomic weight the answer is:
1. For example, chlorine has a listed atomic weight of 35.453. This is not, however, the mass of every chlorine atom. It is the "average" mass of a chlorine atom. There are two stable isotopes of chlorine, namely 35Cl and 37Cl which exist in the world at the corresponding percentages: (75.78%) and (24.22%). Since roughly one quarter of chlorines have 2 more amu, it makes sense that the atomic weight given is almost 35.5, which would be one quarter of the difference between 37 and 35. It is important to note again, however, that this is an average and not the mass of any actual chlorine atoms. (Also to note, there are other forms of chlorine in very minimal quantities which shift the number slightly, but not noticeably.)
2. Another important cause is the mass deffect (due to the binding energy of nucleons).
Is the element with largest atomic mass always present in highest percentage by mass in a compound?
No, the element with the largest atomic mass is not always present in the highest percentage by mass in a compound. The percentage by mass of an element in a compound is determined by its atomic mass and the total mass of the compound. The composition of a compound can vary based on the number of atoms of each element present.
Why does beryllium have an atomic mass of 9 instead of 8?
The atomic mass of an element is determined by the sum of the protons and neutrons in its nucleus. Beryllium has 4 protons and typically 5 neutrons, resulting in a total of 9 nucleons (protons + neutrons). This is why its atomic mass is 9 instead of 8.
Is this true or false the mass of a proton is about one atomic mass unit?
The mass of the proton is a little greater than 1 amu:
