Which of the following elements would be classified as a nonmetal? a.) silicon  b.) francium c.) bromine d.) calcium

Q: What is an element composed of?

A: An element is a pure material made up of atoms with the same number of protons in their atomic…

Q: 1. A scientist collects data on a sample of Lithium. He determines that 92.3% of the sample is…

A: The atomic mass of lithium = 6.938923 amu

Q: did john dalton give us the "raisin bun" model of the atom where negative and positive charges are…

A:

Q: State the main points of Dalton’s atomic theory using your own words. Which parts of Dalton’s theory…

A: Introduction: John Dalton, in the year 1808, put forward his atomic theory on the nature of matter.…

Q: Why has the atomic model changed over time?

A: Atomic model are the model proposed by eminent scientist to explain the structure of the atom and…

Q: A sample of element X has two naturally occurring isotopes. The isotope X-45 makes up 35.8% of the…

A: Isotopes are species having same atomic number but different mass number.  Given: The percentage of…

Q: Who made the periodic table

A: Periodic table is a arrangement of elements are found in nature on the basis of atomic number.…

Q: Oxygen is a _______ and therefore _______ when it forms an ion   A. nonmetal;       loses…

A: Oxygen is a nonmetal element.

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: How are the concepts of an atom and an element related? What causes elements to differ?

A: A particular atom will have the same number of protons and electrons and most atoms have at least as…

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

A:

Q: Describe the general structure of an atom and its isotopes.

A: Atom is the basic unit of matter it consists of a heavy positive mass at its center called the…

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: Is the statement inconsistent with Dalton’s atomic theory as it was originally stated? Why? Two…

A:

Q: How many elements are presently known? About how many occur naturally?

A: Periodic table contains 119 elements but the last elements 119 know as Ununennium or eka-francium is…

Q: Characterize elements and their isotopes.

A: Due to the discovery of various elements, it was very difficult to organize and study the…

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: 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: Calculate the number of atoms in sample. 14.955 g Cr

A: Avogadro's  number gives the number of atoms, molecules or ions in one mole of the substance and it…

Q: A. What is the mass number of an atom of Iron ( atomic number 26) with 32 neutrons?  B. Is this…

A:

Q: Where on the periodic table are the most nonmetallic elements found?

A: Elements that gains electrons and form their respective anion are known as non-metals.   Seventeen…

Q: What did Ernest Rutherford discover about the structure of an atom ?

A: Rutherford carried out alpha-particles scattering experiment by the bombardment of high speed…

Q: True or False -Atomic theory doesn't need to be taken seriously because it's just a theory ....

A: Given statement is, Atomic theory doesn't need to be taken seriously because it's just a theory

Q: Calculate the atomic mass of naturally occurring chlorine if 77.62% of chlorine atoms are…

A: To calculate atomic mass of chlorine:

Q: How many electrons are in gold atom? Does protons also take part in chemical reaction?

A: Gold is a chemical element with the symbol Au and atomic number 79, making it one of the higher…

Q: Summarize the history of thedevelopment of atomic theory,beginning with Dalton

A: Every matter is made up of atoms. The theory we study today took a long time for its discovery. The…

Q: When an atom has one or more extra ____ it will have a ___ charge

A: An atom has an equal number of electrons and protons. i.e Number of protons= Number of electrons.…

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: Metals (in its ionic state) if heated will radiate light, this is because of the reaction of:  a.…

A: Metals are good conductors of heat and electricity. This is because of transfer of electrons from…

Q: Consider the following information about three atoms: (a) How are they similar to one another? (b)…

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

Q: a certain compound is made up of 2 chlorine atoms, one carbon atom, and one oxygen atom. What is the…

A: A chemical formula is defined as the composition of elements present in the compound in a fixed…

Q: What is the electrical charge of water?

A: The compound given is water.

Q: Describe our current understanding of an atom?

A: The solution is given  below-

Q: What is an element?How are elements arranged in the periodic table?

A: The elements starting from hydrogen having atomic number 1 to the element with atomic number 118 are…

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: d. Sulfur trioxide, SO, e. dinitrogen tetroxide, N,O, f. Chlorate, CIO," (one chlorine and three…

A: The species given are SO3, N2O4 and ClO3-.

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: BARIUM COMBINES WITH SULFATE TO FROM? Which is the formula?

A: Barium cation (Ba2+) and the Sulfate anion (SO42-) forms a salt Barium sulfate(BaSO4), in which…

Q: Describe the transformation A to B C to D and D to E Black Balls are carbon, white balls are…

A: Stereoisomers are the compound that has same chemical formula but different arrangement of the atoms…

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

A: Element Ar having three isotopes one is Ar-36, second is Ar-38 and last one is Ar-40  Ar-36 have…

Q: Why did different drops have different charges? • View Available Hint(s) Because the drops were…

A: To solve this problem we will use the given concept of Millikan Oil drop experiment .

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: what are isotopes

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

Q: which contains more atoms, 1 gram on gold or 1 gram of silver? explain please

A: 1mol of any substance contains 6.023 × 1023  number of atoms. 1mol of any substance means its atomic…

Q: n elemental metal contains how many types of atoms?

A: Elements are the substance that is composed of a single type of atoms.

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…