What is the mass number of Hg from the periodic table?

Q: Calculate the average atomic mass

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Q: How many Sc atoms are there in 5.35 moles of Sc?

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Q: The nucleus, the massive center of an atom, contains which two particles?

A: Nucleus is the massive part of any atoms . It contains mostly all the mass any element. Nucleus was…

Q: What are subatomic particles?

A: Sub atomic particle, also called elementary particle, any of various self contained units of matter…

Q: What are isotopes and how are they related to the atomic weight?

A: Isotopes are the compounds with same atomic number but different mass number. They have same number…

Q: Define mass number

A: Solution- Mass number - The sum of the Neutrons and protons present in the an atom is called mass…

Q: What is atomic weight?

A: The Matter is composed of the smallest unit known as an atom. The atom has 3 subatomic particles…

Q: How many protons neutrons and electrons are present in a single atom of osmium - 190?

A: Since the Atomic number of Osmium = 76  Hence number of electrons = Atomic number = 76

Q: (i) What is the mass of a neutron? (ii) What is the charge of a neutron?

A: Neutron is a subatomic particle as like proton. It is found in the nucleus along with proton and it…

Q: Determine the number of atoms in a 1.00 mg sample of Carbon-14?

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Q: What is the change in mass of 180 Ta when it is formed from protons, electrons and neutrons if the…

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Q: Can we tell the exact mass of a particular atom by looking at the periodic table

A: The periodic table is a table in which a total of 118 elements are placed on the basis of their…

Q: What is the number of neutrons in I-131?

A: Given, Element : I-131 Number of neutrons = ? Note: In the modern periodic table, iodine (I) belongs…

Q: One atom of Se-77 is 6.410 times as heavy as an atom of C-12. What is the atomic mass of Se-77?

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Q: One atom of an unknown element has a mass of6.66 × 1 0 -23 g. What is the identity of this element?

A: Molar mass is the mass of Avogadro's number (6.022×1023) atoms.

Q: What is the difference between the atomic mass and the atomic weight?

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Q: Which element accounts for roughly 75% of the observed mass of the universe? Which four elements…

A: Hydrogen is the most abundant element in the universe which aaccounts for roughly 75% of the…

Q: An element has three naturally occurring isotopes. What other information must you know in order to…

A: Natural abundance and mass number of atoms of an element are required for calculation of atomic mass…

Q: What is atomic mass? How is it calculated?

A: Atoms are the smallest constituents of a chemical compound and the atoms do not have independent…

Q: What is the atomic weight of copper

A: The atomic number (Z) of a chemical element is tells that the number of protons in the element.

Q: What is the mass number of an atom of calcium that has 21 neutrons?

A: We know ,  Mass number of an atom = number of proton + number of neutron

Q: How would you determine the accuracy of an atomic mass?

A: The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of…

Q: Calculate the number of atoms of Zn in a sample with mass = 2811 amu.

A: We have to predict the number of atoms of Zn.

Q: A sample of Fe_20_3 (MW= 159.69 g/mol) has a mass of 0.277 g. What is the mass of Fe in the sample?…

A: Molar mass of compound is individual sum of atomic mass of each atoms present in compound

Q: (a) What is the mass in amu of a carbon-12 atom? (b) Why is the atomic weight of carbon reported as…

A: Carbon is an element having atomic number 6. It belongs to 14th group and 2nd period. The valency of…

Q: How many grams of Xe are there in a sample of Xe that contains 8.97×1023 atoms?

A: First we have to determine the moles of xenon.

Q: Chemical for 3. How many times larger is the volume of the atom than the volume of the CaCl₂…

A: An atom consists of positively charged nucleus at its centre where the size of the nucleus is very…

Q: Describe how the atomic and mass numbers change, with at least one specific example?

A: An atom has a nucleus situated at the center and the electrons are surrounding it. The nucleus has…

Q: ny atoms a

A: The number of moles is determined as the mass of the substance upon its molar mass. The number of…

Q: What is the atomic weight of Nitrogen?

A: Given Nitrogen Atom. We need to determine the atomic weight of Nitrogen.

Q: A 2.25 mol sample of an element has a mass of 51.8 g. What is the element?

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Q: Which part of the atom has most of mass ?

A: Most of an atom's mass is in its nucleus.

Q: I was given the data, I just can't seem to figure out the mass part.

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Q: Determine the mass of Strontium-86 (in u) given that the average atomic mass of Sr is 87.6126 u and…

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Q: explain how we calculate the mass of an atom and why we write this down in atomic mass units

A: Atomic mass of an atom is the sum of total number of protons and neutrons present in the atom. It is…

Q: What element has a mass number of 9 and has five neutrons in its nucleus?

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Q: The mass ratio of sodium to chlorine is sodium chloride is 0.649:1.  A sample of sodium chloride…

A: 2NaCl ------> 2 Na + Cl2 Mass ratio of sodium to chlorine is sodium chloride is 0.649:1. Sample…

Q: What are the symbol and name for an element whose average atoms have a mass that is 38.8% of the…

A: mass of an average Chromium atom =51.9961 u Now we have to calculate 38.8% of the mass of an average…

Q: Give a Characteristics of an Atomic?

A: Solution-   An atom has three subatomic particles The nucleus has a well-charged atomic center and…

Q: How many electrons are necessary to produce a charge of -1.0 C? What is the mass of this many…

A: SOLUTION: Step 1: An electron has a charge of -1.6 ×10-19 C. The no of electrons necessary to…

Q: What is the mass of 1.595 moles of argon?

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Q: Why is the mass corresponding to a mole of one element different from the mass corresponding to a…

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Q: Atomic o Mass Number of Name uon lo Symbol Number Neutrons W. Number 8. 2raon ls. 1sd: bozogorq 10 6…

A: Atomic number of an atom is equal to the number of protons present in it. It is written in the…

Q: How to determine the mass number of an atom given the atomic mass (amu)?

A: Mass number is the sum of total number of protons and neutrons in an atomic nucleus.

Q: An unknown element X has the following isotope: 25X (80.5% abundant) and 27X (19.5% abundant). What…

A: Given : Isotope 1 : X25            Atomic Mass = 25           % Abundance = 80.5 %…

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Q: The number of protons, neutrons, and electrons in a nucleus of Br-80 is

A: The nucleus given is Bromine, Br-80.

Q: When the Number of Neutrons Varies?

A: Atomic number (Z)- the number of protons or electrons present in an atom of element called as atomic…

Q: (a) Define atomic number and mass number. (b) Which of these can vary without changing the identity…

A: a)Atomic number (Z) is defined as the number of protons present in the atom.Mass number is defined…

Q: How many protons are there in the nucleus of Cu-64?

A: Atomic number (Z) is defined as number of protons present in an atom.  In a neutral atom number of…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.