The mass number of an isotope tells you the number of...    A.protons and electrons.   B. protons.   C. nucleons.   C. electrons.    D. neutrons.

Q: A certain element contains one atom of mass 10.013 ufor every four atoms of mass 11.009 u. Compute…

A: Given data contains, Mass of first isotope is 10.013 u. Mass of second isotope is 11.009 u.

Q: The element stramonium (Sa, average atomic mass 628.23 u) reacts with the element kingsine (Ks,…

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Q: Describe and illustrate Dalton's Model, Thompson's Model, and Bhor's model of the atom.

A: Thompson's Model: J. J. Thomson performed experiments studying cathode rays and discovered that they…

Q: a. How many carbon atoms are in the sam b. How many hydrogen atoms are in the s c. How many oxygen…

A:

Q: The Periodic Table of Elements is arranged based on the atomic number. Hence, it is arranged based…

A: General chemistryThe Periodic Table of Elements is arranged based on the atomic number. Hence, it is…

Q: Accordingly, which of the following statements is wrong?    A) The mass of an aluminum atom is…

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Q: A given compound always contains the same proportion (by mass) of the elements. This principle…

A: A compound is formed by the combination of two or more elements through chemical bonding.

Q: Help me with understanding how to calulate mass for A1 and A2

A: Molarity = mole of solute(mol)volume of solution (L)Mass of compound = moles × molar mass1mL =…

Q: Bromine also occurs in nature as two isotopes. What is the specific mass of each isotope? What is…

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Q: A certain mass of carbon reacts with 455.9 g of oxygen to form carbon dioxide. ________ grams of…

A: According to Law of multiple proportions:     C  + O2 → CO2    ----Eqn 1     C  + 1/2O2 → CO…

Q: Can you figure out why most of the α-particles in Rutherford's experiment went through gold foil…

A: Rutherford's experiment is to determine the structure of an atom where Rutherford used alpha…

Q: What came first? protons neutral Atoms or nuclei? which came second?

A: Given What came first? protons neutral Atoms or nuclei? which came second?

Q: Use an example to explain why we say that an atom is thesmallest unit of a substance

A: Atom It is smallest particle unit of matter that retains all chemical properties of the element. It…

Q: The number of protons (is, is not) always equal to thenumber of electrons in orbit around the…

A: The symbol of an element is defined as  ZXA Where  A = mass number = Z + N              Z  = Atomic…

Q: Which of Dalton’s postulates about atoms are inconsistent with later observations? Do these…

A: In 1808 John Dalton has provided the first atomic theory. He has stated that all matter is made up…

Q: 1.25 moles of PbO2 have a mass of

A: Given  Number of mole of PbO2  = 1.25 mole  Mass = ?

Q: The element stramonium (Sa, average atomic mass 628.23 u) reacts with the element kingsine (Ks,…

A: Mass of one molecule of SaKs7 = ( average atomic mass of Sa )+ ( 7 X average atomic mass of Ks )…

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: Create a timeline using illustrations and text showing elements form with the concept of atomic on…

A: Modern periodic table based on Mendeleev's periodic table is based on the arrangement of elements…

Q: Mass Isotope from the list, and answer the following questions for each term: What familiarity and…

A: The two given terms are  Mass Isotope Dear student since it is a multiple subparts questions,…

Q: A scientist has two samples of gas: The first sample contains one mole of argon atoms and has a mass…

A: 1 mole of any gas has equal no. Of atoms i.e., avogadro no. of atoms 6.023*1023 atoms. Or Equal…

Q: mass of magnesium ribbon before experiment is 0.33g mass afer is 0.49g    Determine the mass of…

A: 0.1945 g of O2 combines with Mg to form 0.49 g of MgO.

Q: 21. Using Example 2.11 page 64 of your textbook to obtain the mass % of chlorine (Cl) in CH2Cl2 and…

A: Molar Mass of CH2Cl2 = 84.93 g/mol Molar Mass of CHCl3 = 119.38 g/mol We have to find out the…

Q: Summarize indicating Dalton major contribution to the atomic theory.

A: Dalton’s atomic theory was a scientific theory on the nature of matter put forward by the English…

Q: In a neutral atom the number of protons equals

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Q: What is the mass of 1 mole of pennies? ? How many moles of pennies have a mass equal to the mass of…

A: Q1) One mole of any substance contain Avogadro number of particles. One mole of pennies contain…

Q: Explain how and Dalton's atomic theory explains the fact that mass is conserved in chemical reaction

A: To find: Explain dalton's atomic theory and the fact that mass is conserved in a chemical reaction

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: What is the Law of Multiple of Proportions?

A: Law of Multiple Proportions ----- When two elements react to form two or more compounds, than the…

Q: Suppose that a person counts out gold atoms at the rate of one each second for the entire span of an…

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Q: a. How many hydrogen atoms are in the picture? Nitrogen? b. Does the formula indicate how many atoms…

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Q: Whith of the following is not one of Dalton's laws? a) Atoms are indestructible. b) Atoms of the…

A: Dalton's atomic theory are as follows  (1) Atoms are indivisible,tiny particle of same size and same…

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

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

Q: ny atoms c

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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: 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: The 3rd postulate of Dalton’s Atomic Theory is consistent with a Law developed by a French scientist…

A: 1st atomic theory is proposed by John Dalton, That talks about atoms and it's properties, named as…

Q: Calculate the number of atoms in sample. 39.733 g S

A: Given, Mass of Sulfur = 39.733 g

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: What is the mass of one mole of Sg?

A: Mass of one mole of any element means it's molar mass

Q: The element argon has three isotopes and an average atomic mass of 39.948 u. Idenitfy the most…

A: Given that, Average  Atomic mas s of At=39.948 amu

Q: What is the mass of theis example explain

A: Explainination :      In mass spectroscopy, neutral organic molecule (M) in the vapour or gaseous…

Q: 11) Calculate the number of atoms of each element: 5Na,SO,

A: according to mole concept one mole of any species contains avagadro number of atoms,  molecule and…

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.