What is atomicity

Q: 200 words, explain of what are atoms composed?

A:

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: The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the…

A: To find the average atomic mass, summing the masses of the elements isotopes, each multiplied by…

Q: A sample of element Z has two naturally occurring isotopes.  The isotope Z-24 makes up 68.9% of the…

A: Interpretation: We have to calculate average atomic mass.

Q: Naturally occurring copper consists of 63Cu (mass 62.9296 amu) and 65Cu (mass 64.9278 amu), with an…

A:

Q: An unknown element (Uk) has three isotopes, seen in the table. One of the percentage values is…

A:

Q: What pattern exists between an atom's mass and its vertical position in the periodic table? What…

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Q: A sample of aluminum foil contains 7.80×10^23 atoms. What is the mass of the foil?

A: A sample of aluminum foil contains 7.80×1023 atoms. The mass of the foil is to be calculated.

Q: A hypothetical element, E, has two stable isotopes. One isotope has a natural abundance of 66.909%…

A:

Q: How does Chemistry provide a background for understanding the properties of matter in terms of…

A: To explain the structure of atoms, avrious philosphers and scisnitists proposed a number of theories…

Q: What is the mass of 100 platinum atoms?

A: Atomic mass, the amount of matter found in the element atom. It is expressed as a multiple of…

Q: n your own words, define or explain these termsor symbols: (a) ; (b) particle; (c) isotope; (d) ;(e)…

A: Chemistry is the study of elements and compounds comprised of atoms, molecules or ions. It involves…

Q: A sample of aluminum foil contains 4.50×1023 atoms.4.50×1023 atoms. What is the mass of the foil?

A: Given,  Number of atoms of Al foil = 4.50 x 1023 atoms  Mass of the Al foil = ?

Q: Imagine that you were working in the lab at Amgen (a biotech compan Thousand Oaks) and you discover…

A: Isotopes of elements contains same number of protons but different number of neutrons.

Q: A 20.0 g sample of an element contains 3.89 x 1023 atoms.

A: Given:-  Number of atoms = 3.89 × 1023atoms Mass of sample = 20.0g

Q: Define atomic number, mass number, isotope, atomicmass, and mole.

A: Anything that occupy space and has mass is called matter which  is made up of atoms. Atoms are…

Q: Why is it important to study atomic theory?

A: Matter is composed of small particles . Atomic theory tells about the particles and refereed them as…

Q: What is an atomic mass unit? Why is it necessary to introduce such a unit?

A: Matters are the substances that possess some mass and volume. These are formed by joining very small…

Q: What is the chemical formula of sodium chloride

A: Sodium chloride is the chemical name for salt. Sodium is an electrolyte that regulates the amount of…

Q: Which elements make up about 99% of the mass of living things?

A: Elements are very important for the maintenance of biological life. For example sodium and potassium…

Q: A sample of aluminum foil contains 6.50×1023 atoms.6.50×1023 atoms. What is the mass of the foil?

A: Mole concept: The number of molecules or atoms present in the one mole of the substance is equal to…

Q: Explain why atomic masses are not whole numbers.

A: The atomic masses are an important quantity of each element. Each element of the periodic table will…

Q: The total number of atoms in NaCI

A: The number of atom of an element in its molecules is known as atomicity. SodiumChloride or NaCl is…

Q: What do you mean by Atoms? Define the Periodic Table ?

A: There were different beliefs about the nature of matter: In the 6th Century B.C. in India, an Indian…

Q: oxygen atoms

A:

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: Whose work is credited with being the beginning of modern atomic theory?

A: The scientist whose work was credited in the beginning of modern atomic theory has to be given.

Q: 22. As in question 21 determine the mass % of N (nitrogen atoms) in ammonia (NH3), urea (CHẠN2O) and…

A: Mass percent is the mass of the element divided by the mass of the compound or solute.

Q: explain how to get the atomic symbol

A: Atomic symbol is way of representation of a particular element that makes easy handling of elements…

Q: The atomic weight of Aluminum elemen

A: 1mol = 6.022 x1023 electrons  Given that  Atomic mass of Al = 26.981 g/mol  Atomic number of Al =…

Q: What is the atomic weight of the element chlorine?

A: Average atomic weight of chlorine element is 35.5 amu. Chlorine atom has two isotopes Cl35 and Cl37…

Q: In ions why not separated by mass only and  why not separated by charge only?

A: Mass spectrometer works in four stages which is ionisation, acceleration, Deflection and detection.…

Q: Atoms differ from ions in number of

A: Atoms are neutral; they contain the same number of protons as electrons. an ion is an electrically…

Q: ny atoms c

A:

Q: Why chemists use models to study atoms?

A: An atom is composed of three component particles which are electrons, protons and neutrons.  The…

Q: atoms

A: it is made of 3 tiny partical  known as electron ,proton and neutron  Neutron  and proton make…

Q: An ion has 28 protons, 24 electrons, and 30 neutrons. What is its ionic charge?

A:

Q: What did Rutherford conclude about the atom that would explain the unexpected result explain

A: Rutherford performed the α-particle scattering experiment and observed that most of the α- particles…

Q: What is modern Atomic Theory?

A: Given term, Modern atomic theory Atom - a fundamental particle of matter (i.e. anything that can be…

Q: A student says,A carbon atom is not the smallest possible amount of carbon, because atoms are built…

A: An atom contains electrons, protons and neutrons. Therefore, a carbon atom is composed of its…

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 is the atomic mass unit, amu, defined?

A: 1 a.m.u. = 1.66 × 10-24 g

Q: What is the average mass of a single aluminum atom in grams

A: We know that mass of 1 mole of Aluminium atoms is equal to 27g Also 1 mole of aluminum atoms means…

Q: 49.4g of Cr represents how many atoms?

A: Number of Atoms = moles of Atom X Avogadro's number  Avogadro's number  = 6.022 X 1023  And moles of…

Q: A 3.6 g sample of lithium contains how many atoms?

A: Since moles = mass / molar mass  Given : mass of Li i.e lithium = 3.6 g And since molar mass of Li =…

Q: Question attached

A: Isotopes are variants of a particular chemical element which differ in neutron number, and…

Q: what are isotopes

A: The different variants of a particular element, that are differed by the number of neutrons. In…

Q: An element´s relative mass, expressed in atomic mass units on the periodic table, is equal to its…

A: The mass of an atom can be expressed in different forms like molar mass,  relative mass, atomic mass…

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.