Q5. Which element is a halogen?(a) Ne (b) O (c) Ca (d) I

Q: An atom of the isotope 138Ba2+ consists of how many protons (p), neutrons (n), and electrons (e)?

A: Isotope is an element with same atomic number but with different mass number. Protons(e+) are the…

Q: What is distinctive about isotopes of elements, and why are they important?

A: The atomic number of an element is expressed as the number of protons and it is equal to the number…

Q: An imaginary element has two naturally occurring isotopes and has an average atomic mass of 150.2…

A: The relative abundance of each isotope is calculated using equation (1) in which mavg is the average…

Q: 4. What are the main ideas in the nuclear theory of the atom?

A: The main ideas of nuclear theory of an atom has to be given. The atomic model of Rutherford is also…

Q: The mass of 6 million molecules of a diatomic gas is 5.1  × 10-19 kg. What is the atomic mass of the…

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

Q: Which elements are alkaline earth metals?(a) rubidium(b) tungsten(c) magnesium(d) cesium(e)…

A: Alkaline earth metals are the elements present in the group 2 of the periodic table. Their general…

Q: Differentiate between different isotopes of an element?

A: A number of atoms of some elements have been identified, which have the same atomic number but…

Q: What element is found in period 4, group 4A? Use the atomic symbol to identify the element.

A: Given : Period of element is 4  Group of element is 4 A.

Q: 23U → 23Th + He 2. For each element, what do the top (superscripted) and the bottom (subscripted)…

A: Introduction: In the above reaction nucleus of uranium undergoes alpha decay ,in this nuclear change…

Q: 4. If you were given an antique piece of jewelry and you were told that it was made of solid gold,…

A: There are several tests that are used to detect the purity of gold used by jewelry manufacturers…

Q: What element has a symbol of K?

A: An atom is the basic and fundamental unit of matter. An atom consists of electron and the nucleus in…

Q: 2-81. (*) A 40.0-milligrams sample of the compound X.O, contains 22.5 milligrams of oxygen atoms.…

A: We have a 40 mg of sample  of X4O10, which contain 22.5 mg of oxygen atoms,  We have to calculate…

Q: For each of the elements Na, Ni, Al, P, Cl, and Ar, providethe following information:a. Which are…

A: In the periodic table, elements are arranged as a function of their atomic number. There is a…

Q: Roughly speaking, the radius of an atom is about 10,000times greater than that of its nucleus. If an…

A: The radius of the atom in miles has to be given,

Q: If an atom were 4.5 football fields long, the nucleus would be the size of   a. a grape seed.   b.…

A: Given: Atom is 4.5 football field long To determine: Size of nucleus

Q: what is the diameter of the “atom” with a nucleus this size?

A:

Q: The elements in Groups 1A(1) and 7A(17) are all quite reac-tive. What is a major difference between…

A: The elements of group 1A and group 7A are reactive elements that form many compounds.

Q: What is the atomic mass of Lithium, if 7.49%  is Li-6 and 92.51% of Li-7?

A: Given, The natural abundance of Li-6 = 7.49 % The natural abundance of Li-7 = 92.51 %   Considering,…

Q: What is the atomic weight for the element that is in group 5A and period 4?

A: given: group 5A period 4

Q: What fundamental force is responsible for holding together the subatomic particles of an atomic…

A: There are various physical forces acting all around us. Four fundamental forces are listed below:…

Q: That is to say the atom 108 47Ag . Determine the number of protons, neutrons and electrons in this…

A: The general representation of the atomic symbol. XZAWhere, X = atomic symbolA = mass no.Z = atomic…

Q: A sample of the nonexistent element mythium consists of 25.59% of an isotope with mass number 580,…

A:

Q: 2. Describe cathode ray tube experiment by drawing its diagram.

A:

Q: The element gallium (Ga, Z = 31) is what type of element

A: Atomic number of Gallium(Ga) is 31.Electronic configuration is [Ar] 3d104s24p1.It is a p- block…

Q: Which of the following describes an atom that is not an isotope of the other two? And why a)14p,…

A: Which of the following describes an atom that is not an isotope of the other two?

Q: Which element is a halogen? (a) Ne (b) O (c) Ca (d) I

A: The substances that have a tendency to occupy space are considered as matters. The matters can be…

Q: If a sample of gallium contains 1.56×104 atoms of gallium-69 and 1.02×104 atoms of gallium-71, what…

A: Given,1.56×104 atoms of gallium 69.1.02×104 atoms of gallium 71.

Q: .What is the difference between the number of electrons in an atom of selenium, Se, and the number…

A: The number of electrons of an atom is equal to the atomic number of that atom. These are the…

Q: 13. Which pair represents isotopes? a. He and »He b. seFe and sa:Mn c. Si and suP 14. Which pair…

A: Identify isotopes pair among them --

Q: Rubidium has two naturally occurring isotopes. The elemental mass of Rb is 85.4678 u. If 72.165% of…

A: Given: Rubidium has two naturally occurring isotopes. The elemental mass of Rb = 85.4678 u The…

Q: What element is defined by the following information?    p+=20  n ^o=20   e^-= 20

A:

Q: b. Rutherford created the cathode-ray tube and was the lith Which of the following is(are) correct?…

A: The correct statement (s) are to be determined. (a) Ca2+2040 ion : The atomic number=20 The number…

Q: If the heaviest isotope (A) is more abundant and the other isotopes (B & C) were less abundant,…

A: The periodic table's atomic mass is the average weight of all its isotopes. Average atomic mass of…

Q: An atom has a very small nucleus surrounded by an electron "cloud." The figure below represents the…

A: The diameter of the nucleus is given that 2 mm. The electron cloud or diameter of atom is 200m. That…

Q: Select the single best answer. For this pair of elements (F and Se), predict which one has more…

A:

Q: The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the…

A: Average atomic mass = ∑i=1n (mass of ith isotope)(% abundance of ith isotope)100 Where "n"…

Q: d) how many 4°K atoms are present in a piece of copper block weighing 615 g? The percent isotope…

A: 12. d) The mass of the copper block is = 615 g The percent of 40K isotope is = 12.05 % The number of…

Q: 6. No element exists with mass number larger than about 300. Explain Why?

A:

Q: While looking at bromine (Br) on the periodic table, a student needs to find another element with…

A: The

Q: Which of the highlighted elements in Figure P2.7 is (a) a reactive nonmetal, (b) a chemically inert…

A: Reactive metals exist in group 1 of the long form of periodic table. Group 1 is placed at the…

Q: An element has two naturally occurring isotopes. One has an abundance of 51.839% and an isotopic…

A:

Q: Ernest Rutherford concluded from experiments that they indicated nuclei of atoms are relatively O A.…

A: Correct ans- Far apart and positively charged.

Q: Do isotopes have the same chemistry among each other? Do they have the same electron configuration?

A: Isotopes of an element have same number of protons with different number of neutrons in the nucleus.…

Q: Since different isotopes of the same element have the same chemical behavior, how can they be…

A:

Q: (a) Define atomic number and mass number. (b) Which of these can vary without changing the identity…

A: a)Atomic number (Z) is defined as the number of protons present in the atom.Mass number is defined…

Group 14 Elements

The following elements come under group 14 of the periodic table.