Mark the following statements as true or false. If a statement is false, correct it to make a true statement. a. The mass number of an atom is the sum of its neutrons and protons. b. Electrons travel in orderly, circular orbits around the nucleus. c. Protons and neutrons have a positive charge and electrons have a negative charge. d. Valence electrons are the electrons in the outermost shell of an atom. e. Every element has a characteristic number of protons, which is called the element’s mass number.

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: Mass Mass Abundance Abundance Avg. mass (from Table 1) Symbol (from Table 1) (Avg. Mass) x (% Abun…

A: Isotopes are same elements that have same atomic number, that is same number of protons, but differ…

Q: According to Coulomb’s law, what happens to the potential energy of two oppositely charged particles…

A: What happens to the potential energy of two oppositely charged particles as they get closer…

Q: Static electricity is observed when whic part of the atom is transferred? a. Protons b. Neutrons I…

A: Static electricity is observed when electrons are transferred .  Naturally occurring static is…

Q: The function of the electric field in a mass spectrometer is. A To knock electrons off the atom or…

A: The first step is the formation of an ion with the help of an electron beam and after the ionization…

Q: Describe Rutherford’s planetary model of the atom.

A: Rutherford model or Rutherford atomic model or nuclear atom, or the planetary model of atom gives…

Q: how would you describe the elements from group 1 to group 12 in the periodic table

A: To find: how would you describe the elements from group 1 to group 12 in the periodic table

Q: 13. What were the 4 ancient elements that Empedocles described? 14. List the six ideas of John…

A:

Q: How did Mendeleev come up with the first periodic table of the elements?   A:He estimated the number…

A: To explain: How did Mendeleev come up with the first periodic table of the elements.

Q: How and by whom was the electron discovered? What basic properties of the electron were reported…

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

Q: Why were the results of Rutherford's gold foil experiment surprising? Oa. They demonstrated that the…

A: Ruderford does the gold foil experiment with bombardment of alpha particles over it.

Q: Periodic Table Matching - Part B Periodic Table Matching - Part C Argon (Ar.) A. Atomic mass is more…

A: Given, Elements from periodic table. We have to match the properties of each element with the given…

Q: + а. Bohr b. Dalton C. Rutherford d. Thomson 3. Which atomic model was the first to show a nucleus,…

A: 27) in the Given figure, the model of an atom was proposed by Thomson.

Q: Go Figure What is the charge on the particles that form the beam? Will they beattracted to or…

A: Basic unit of matter is atom. Study of atom was done by many scientists. Each scientist made some…

Q: 1. How are electrons arranged in atoms? In particular, what are the possible positions and what are…

A: Electron configuration is referred to as the distribution of electrons of an atom or a molecule, in…

Q: 21. What force holds electrons near the nucleus of the atom? A. Strong nuclear force B.…

A: From the concept of periodic trends of elements and atomic mass of elements the following questions…

Q: In this following activity, use the pictures of each element and your research about the properties…

A: Given : We have to arrange the given compound in the group.

Q: 1. What is the name of John Dalton's theory? 2. What are elements made of? 3. An atom of hydrogen…

A: As you have posted a question with multiple parts, we will solve the first three parts for you. To…

Q: 1) a. Define mass number of an atom with examples. b.what is nucleus and electron of an atom?

A: Mass number is  the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Q: A(n) ______________________ has a negative charge an a mass about 1,800 times smaller than a proton.…

A:

Q: The Bohr model of the atom was an important discovery that led to the modern theory of atomic…

A:

Q: How is atomic number related to the identity of the atom? What might happen if the relationship…

A: The atomic number denotes  the number of protons in an atom of the element.

Q: ACROSS 2. Rutherford discovered that electrons orbit this atomic structure 5. Rutherford used…

A: Rutherford model was proposed by Ernest Rutherford in 1911. And cathode ray experience was done by…

Q: List and explain Dalton's atomic theory (postulates). Explain which postulates were rejected and…

A: John Dalton gave the first postulates about the structure of an atom......

Q: 1. Johanne Dobereiner noticed that when the elements in the atomic mass, the mass of the middle…

A: As you have posted a question with multiple parts, we will solve the first three subparts for you.…

Q: The force that holds the two atoms together is the attraction of the two nuclei attraction of an…

A: Choice 4th is correct.

Q: 1. Periodic table and electron configurationa) How many protons, electrons and Neutrons does the…

A: Hey, since there are multiple sub-parts posted, we will answer first three sub-parts. If you want…

Q: What basic properties of the electron were reported with its discovery?

A: The electron was discovered by an English physicist J.J.Thomson. J.J.Thomsom performed a cathode-ray…

Q: 24 - Which of the following refutes Dalton's statement: "The smallest building block of an element…

A: Dalton proposed his theory in 1808 in which he said that atom is the basic unit of matter and also…

Q: What refinement had to be made in Dalton’s atomic theory to account for Gay Lussac’s results on…

A: Dalton's atomic theory was based on law of relative masses, but the masses of chemical compounds in…

Q: Match the discovery/ideas/experiment to the contributor Found evidence that the atom is mostly empty…

A: We are given ideas/experiments/discoveries related to atomic structure and we have to identify the…

Q: element from the periodic table between #3-20 Create a drawing that shows the "Bohr Models" of the…

A:

Q: Rutherford’s gold foil experiment gave scientists clues to the composition of the atom. One thing…

A: In Rutherford's Gold foil experiment,  proved that atom composed with two things - - 1) positively…

Q: b. (i) A Group in the modern Periodic Table is completely missing from Newlands' Table. What is the…

A: Comparing Newlands table (law of octave) with modern peridic table, we can easily find these…

Q: After studylng the chemical reactions of many compounds made of carbon, August discovers a chemical…

A: According to the question, we need to determine the missing words in the following phase.

Q: According to the law of conservation of matter, what happens to the atoms in a chemical reaction?…

A: (a) The atoms are rearranged with no loss in mass

Q: What are the Elements? Classify the features of elements?

A: Given term,      Elements and the features of elements classification,

Q: Why Rutherford’s model could not explain the stability of an atom?

A: Models for electrons- J.Thomson in 1897 discovered electron with the help of cathode ray tube…

Q: Explain the relationship between an atoms number of electrons it’s relative stability

A: An atom contain negatively charged electrons and positively charged nucleus.

Q: Based on the bohr model explain the location of the lithium element on the periodic table. Why is it…

A: Answer

Q: 6. Briefly explain (i) Thompson Experiment OR (ii) Rutherford Experiment emphasizing the…

A: After the discovery of cathode ray, various experiment on cathode ray was conducted to know the…

Q: Draw your own concept of an atom. You may refer to the model given by Bohr for an idea of the atom…

A:

Q: How many electrons are in 1 coulomb?

A: Particles that reside inside an atom are called subatomic particles. These particles are electrons,…

Q: Nitrogen (N), has two naturally occurring isotopes: N-14 that has a percent abundance of 99.63 % and…

A: The atomic mass of Nitrogen = ( mass of N-14 X percent of N-14 + mass of N-15 X percent of N-15) /…

Q: How is the periodic Table arranged? (A) Horizontally ( B) Vertically (C) Atomic Mass. (D) Periods…

A:

Q: Which statement below best explains why Ernest Rutherford was expecting the alpha particles to pass…

A: In Rutherford's alpha particle scattering experiment, the alpha particles are deflected from their…

Q: subatomic particle with a1+ charge

A: In an atom three fundamental particles are present. Positively charged particle proton and neutral…

Q: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?…

A: To find: Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube…

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.