Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. Many spent their lives trying to transform lead (atomic number 82) into gold (atomic number 79). Explain why they never succeeded.

Q: A principal shell with a value of n=3 would contain s,p,d, and f orbitals true or false

A: A principal shell is indicated by the principal quantum number.

Q: two atms of an element have the same number of  protons electrons plus neutrons protons plus…

A: Atoms are the smallest constituent unit of ordinary matter that has the properties of a chemical…

Q: nd 12 electrons

A: Answer If the atomic number of element (Z) is 12 Atomic mass(A) =25 No. of protons= No of…

Q: An atomic nucleus can be described by the analogy “like a marble in the Dallas Cowboys Stadium.” If…

A: Atoms are made up of particles called protons, neutrons, and electrons which are responsible for…

Q: The atomic number on an element tells us the number of

A: An atom is made up of three kinds of subatomic particles called protons, neutrons, and electrons,…

Q: Which of the following substances will have the greatest lattice energy? MgS NaF MgO CaO

A: Lattice energy can be defined as the energy required to convert one mole of an ionic solid into…

Q: Which of the following items are pure elements—that is, made up of only one type of atom? Check all…

A: Our Earth is a planet that has abundant minerals. These minerals were formed as a result of the…

Q: Burning fuel for for warmth or power -- whether the fuel is wood or fossil fuels ike gasoline,…

A: Combustion:  It is an exothermic redox chemical reaction that occurs between a fuel and an oxidant .…

Q: Carbon 14 is an isotope of Carbon-12. What makes Carbon 14 an isotope?

A: Isotopes refer to the atoms of the same chemical element that possess a different number of neutrons…

Q: Look up antimony in the periodic table 1Z = 512. How many covalent bonds would you expect it to…

A: Antimony is a chemical element with symbol Sb and atomic number 51. It is lustrous grey metalloid…

Q: Nitrogen’s atomic number is 7. Just from the atomic number, can you determine how many protons,…

A: The atomic number is by definition the number of protons, positively charged particles, contained…

Q: What does the atomic number tell us about an atom

A: The atomic number which is denoted by Z of a chemical element uniquely identifies the chemical…

Q: Elements have varying numbers of protons, neutrons, and electrons.True or false?

A: Atom is the smallest particle of an element that is composed of subatomic particles such as,…

Q: The atomic mass of an element can be used to determine A) the chemical properties of the element…

A: Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of…

Q: Arrange in order of increasing atomic size. (a) the period 2 elements Li, C, and F (b) the group…

A: According to the question, we have to arrange the following period or group elements in order of…

Q: The distribution of electrons across the shells of sulphur (atomic number = 16) is as follows…

A: The shells of a particular element can hold only a certain amount of electrons. This can be…

Q: Select the best answer or answers from the choices given: The mass number of an atom is (a) equal to…

A: The mass number of an atom is:

Q: Isotopes differ from each other only in the number of electrons they contain.   Select one: a. True…

A: Electrons are subatomic particles. They carry a negative charge.A proton and an electron have the…

Q: Why do the 3s, 3p, and 3d orbitals have the same energy in a hydrogen atom but different energies in…

A: According to the question, we have to explain why do 3s, 3p, and 3d orbitals have the same energy in…

Q: 11H and 13H have (a) different chemical properties because they have different atomic numbers (b)…

A: The chemical properties of an element are not defined by the number of protons. Protons are…

Q: In general, electrons far from the nucleus have more potential (chemical) energy than electrons…

A: The lowest energy would be in electrons nearest to the nucleus. Higher energy will be provided to…

Q: A carbon atom contains six protons and six neutrons.A. What are its atomic number and atomic…

A: CARBON - Carbon is a chemical element with the symbol C . It is nonmetallic and tetravalent—making…

Q: Carbon-14 is a radioactive material. It contains 6 protons and 8 neutrons. During the process of…

A: The objective of the question is to understand the changes that occur in the atom of Carbon-14…

Q: Which elements would be more likely to make a compound with another element

A: In chemistry an element very basic part of any molecule and it is a pure substance consisting only…

Q: Chlorine is an element with the symbol Cl. Draw and label atomic structure of chlorine indicating…

A: ATOMIC STRUCTURE  The Atoms consist of three basic particles: Protons Electrons Neutrons The…

Q: Since we know each element as a defined number of protons, we can also use that number to determine…

A: An element is a pure substance that consists only of atoms which have the same numbers of protons in…

Q: According to chemist John Dalton, if one mole of oxygen is combined with two moles of hydrogen to…

A: The atomic mass of an element is the weighted average mass of the atoms in a naturally occurring…

Q: After completing each reaction, did you have any atoms left over? Why or why not

A: A chemical reaction occurs when one or more substances, known as reactants, are converted into one…

Q: Complete the following table Symbol # protons # electrons # neutrons Atomic Mass Number Number 6°CO…

A: The atomic number is considered as the number of protons exhibit in the nucleus. These protons…

Q: Oxygen has 8 protons, 8 neutrons, and 8 electrons. What is its atomic mass?(a) 8 (b) 16 (c) 24 (d)…

A: In the atmosphere, different elements, atoms, molecules are present like nitrogen, hydrogen, carbon,…

Q: What are some of the applications of Tc-99m? While harder to access, another radioactive isotope of…

A: As per the guidelines, we are allowed to do the first three subparts if more than three are given in…

Q: What if there are a different number of Neutrons? Sometimes elements have a different number of…

A: Isotope is a variant form of an element which has the same number of protons but a differing number…

Abiogenesis