How many atoms are there in 8.1 grams of chromium?

Q: The mass of a "F atom is 18.998 u. What is its mass relative to the mass of an atom of "C? 19F 12C

A: Answer: Mass of one Fluorine atom=18.998u Mass of one Carbon-12 atom=12.0107u Ratio of their masses…

Q: Calculate the mass, in grams, of each sample.a. 1.1 * 1023 gold atomsb. 2.82 * 1022 helium atomsc.…

A: Given data: Avogadro's number NA, 6.023×1023atoms Convert first the number of atoms to moles using…

Q: How many protons and neutrons are present in an atom of 39/19K?

A: Number of protons and neutrons in an atom of  39/19K

Q: A common isotope of Li has a mass number of 7. The atomic number of Li is 3. How can this…

A: The lithium atom has atomic number three, and the number of protons in the nucleus of lithium is…

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: Which statement about subatomic particles are true? Protons have twice the mass of neutrons

A: Subatomic atomic particles: A standard atom consists of three subatomic particles:  Electron Proton…

Q: What is the mass number of an atom that contains a. 42 protons, 42 electrons, and 53 neutrons? b. 24…

A: a. 42 protons, 42 electrons, and 53 neutrons? b. 24 protons, 24 electrons, and 28 neutrons? To find…

Q: How many protons, neutrons and electrons are present in an atom of 40Ca and 119Sn ?

A: The atoms considered are 40Ca and 119Sn.

Q: What particles are found in the nucleus of an atom? What is the charge of the nucleus?

A: Sub-atomic particles are the particles that are present inside the atom. Three sub-atomic particles…

Q: An ion that consists of 16 protons, 32 neutrons, and 18 electrons has:

A: The atom consist of 3 particles-  1- electron 2- proton 3- neutron

Q: Why was it more difficult to discover neutrons than protons or electrons?

A: Neutrons was discovered by James Chadwick in 1932, after the discovery of electrons and protons.

Q: How many protons and how many neutrons are there in a nucleus of the most common isotope of (a)…

A: Atomic number: The total number of protons in the nucleus of an atom gives us the atomic number of…

Q: How many silver atoms are there in 3.84g of silver?

A: 1 mole of any substance contains 6.023×1023 atoms.1 moles of silver atoms weigh 107.87 g.

Q: What is the mass number (A) of an iron atom that has 31 neutrons?

A: Mass number is equal to the sum of the number of protons and the number of neutrons.

Q: How many atoms are there in 182 g of Neodymium?

A: Atomic mass of Nd = 144.2 g/ mol

Q: How many Se atoms are there in a 82.1 gram sample of Se ?

A:

Q: How many neutrons are in the nucleus of the atom 113 Cd? 48

A: We have given that  The element is cadmium    Atomic number of cadmium = 48 Given that mass of…

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

A: The atomic number corresponds to the number of protons present in an atom. It is represented by Z.…

Q: Which statement about subatomic particles are false? Protons have about the same mass as neutrons.

A: An atom is made up of subatomic particles which are protons, neutrons and electrons.

Q: 1. Determine the number of electrons necessary to equal a mass of 1.15 x 10 grams.

A:

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: The numbers of protons, neutrons, and electrons in the 23 Na isotope, respectively, are: 11 اختر…

A:

Q: How many electrons does it take to equal the mass of a proton?

A: An atom is made up of three subatomic particles. These are known as protons and neutrons that are…

Q: How many silver atoms are there in 3.78 g of silver?

A: Given information: Mass of silver = 3.78 g

Q: In a sample of nitrogen, there is 99.63% N-14 atoms and 0.37% of N-15 atoms. What is the atomic mass…

A:

Q: What is the difference between protons and neutrons?

A: We have to write the difference between protons and neutrons.

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: If 4.20 x 1020 atoms of an element have a mass of 55.2 mg, what is the atomic weight of the element?

A: • 1 mole = 6.023 x 1023 molecules/atoms.• 1 mole = molar mass.• No. of mole = No. of atoms6.023 x…

Q: Which pair of atoms constitutes a pair of isotopes of the same element? O ax 6' 19 19 O b. 10 20X…

A: Isotopes are the species that contains same number of electrons and protons but different number of…

Q: An ion of platinum has a mass number of 195 and contains 74 electrons. How many protons and neutrons…

A: Given data: The mass number of platinum ion=195 Number of electrons present in platinum ion=74 To…

Q: If a sample of silver contains 1.29×104 atoms of silver-107 and 1.20×104 atoms of silver-109, what…

A: The percentage of silver-109 in the sample can be calculated by using the formula Percentage of…

Q: What is the mass number of an element that contains 25 protons, 22 electrons, and 20 neutrons?

A: The given data contains, Number of protons = 25. Number of electrons = 22. Number of neutrons = 20.

Q: Element "X" has a mass# of 53. How many neutrons does it have if its atomic# is 27

A: According to the answering guidelines, I'm posting the solution for the first question. Kindly post…

Q: How many neutrons are there in an atom of iron with a mass number of 52?

A:

Q: What is the mass of 4.91x10^21 platinum atoms?

A: Given: Number of platinum atoms= 4.91×1021 we know that Molar mass of platinum=195.084 g/mol

Q: What is the mass number for an atom of osmium containing 76 protons and 112 neutrons?

A: The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of…

Q: What is the mass, in grams, of one argon atom ? 6.64x10^23g

A: The mass of one atom can be calculated by dividing molar mass by avagadro number.

Q: Determine the number of protons and the number of neutrons in isotope. 1940K

A: For any element, we can represent  it in stand form as XAZ where X resents the symbol of the…

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

A:

Q: How many electrons, protons, and neutrons are there in an atom ofa40Ca?

A: In the atom 40 Ca,  Atomic number = 40  So, proton number = 40  As it is neutral so,  Electron…

Q: Calculate the mass of 1.23×10241.23×1024 helium atoms.

A: 1 mole of a substance contains Avogadro number of atoms.

Q: An isotope that contains 4 protons, 4 electrons, and 6 neutrons.

A: Atomic number (Z) is equal to number of protons Mass number (A) is the sum of number of protons and…

Q: How do the terms atomic mass and atomic weight differ?

A: Atomic mass and atomic weight, both the terms are used for measurement of its quantity.

Q: How Many atoms are there in 1.4532 mole of copper?

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Q: What is the atomic mass of Cadmium ? A) 12.011 amu B) 40.078 amu C) 132.91 amu  D) 112.42 amu

A: Given atom,        Cadmium (Cd)

Q: How many neutrons are there in this element?

A: Given : We have to tell number of neutrons in the given element.

Q: what element has 17 protons and 18 neutrons

A: Proton of an element is equal to the  atomic number of element. sum of proton and neutron is equal…

Q: A mass of 18.6 g of an element is known to contain 4.84 x 1023 atoms. What is the atomic mass of the…

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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.