Select the symbol of the element that fits each of the following descriptions: (a) the alkaline earth metal in the sixth period (b) the noble gas in the third perio (c) the actinide with the highest atomic mass (d) the semimetal in Group IIIA/13

Q: Which of the following is described as a pure substance that consists only of atoms with the same…

A:

Q: Using the periodic table, identify the heaviest member of each of the following groups:(a) alkali…

A: a) Alkali metals: Group 1 of periodic table is known as alkali metals and they consist of lithium…

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: What is the atomic weight of element X of an atom X-23 which have an isotopic mass of 23.02amu and…

A: The Atomic Weight of element X ofX23⇒23.02 amu isotopic mass ,X25⇒25.14 amu isotopic mass .

Q: Sketch a modern atomic model of a typicalatom and identify where each type of subatomic…

A: Atomic model is given by many scientists as Bohr's model, Rutherford model etc. Modern atomic model…

Q: and 2 (At Hom ise 2.107 25 of 27 I Review | Constants | Periodic Table ef uses a bag of sand to…

A: Step → Since,       mass = density×volume

Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: Given data, Mass of 101Ru = 100.9 amu Mass of 102Ru = 101.9 amu Percentage abundance of 101Ru =…

Q: Which of the following is False?a. An element is defined by its atomic number.b. Ninety-two elements…

A:

Q: The element with atomic number 38, strontium (Sr), can be found in what period of the periodic…

A: The periodic table is a tabular display of chemical elements arranged according to their atomic…

Q: if the atomic symbol 13354Xe, what is the mass #, # of protons, and # of neutrons?

A: The symbol of an element is given by the expression XZA, where Z is the atomic number and A is the…

Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A:

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: An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass…

A:

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

A:

Q: Which of the following categories includes the majority of the elements metalloids, nonmetals,…

A:

Q: The element (X) is located in the third period and the group (5A) and the element (Y) is located in…

A: The atomic number of the element located between them is 33 & the name of the element is…

Q: Determine the percent abundance for J-67 and J-68, given the following data: The average atomic mass…

A: The average atomic mass of the element J is 65.96amu.   Let the abundance of  J-68  is M %.…

Q: Define the term an element?

A:

Q: 2.34 Describe Thomson's model of the atom. How might it ac- count for the production of cathode…

A: Thomson's model of atom is also known as plum pudding model. According to plum pudding model, atom…

Q: The vitamin niacin (nicotinic acid, C6H5NO2) can be isolated from a variety of naturalsources such…

A: To find: The source of nicotinic acid which is best for use in a multivitamin tablet.

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: Which of the following elements has its name derived from its property of being slightly magnetic?*…

A: Isotopes are the different forms of an element.

Q: Bromine has only two natural isotopes, and they occur in about equal abundance.   If 79Br79Br is…

A: Average atomic mass of an element is obtained by the sum of the product of isotopic mass and natural…

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: Calculate the average isotopic mass of krypton given: Mass / u. Percentage (%) 77.920 0.350 79.916…

A: Calculation of average is done by Mavg = ∑MiXi

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: what group in the periodic table would an element with atomic number 112 belong?

A: • We need to determine the group in the periodic table would an element with atomic number 112…

Q: Enter the appropriate symbol for an isotope of phosphorus-32 corresponding to the isotope notation…

A: The term isotopes can be defined as the variants of a given chemical element that differ in neutron…

Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: Answer :-  R44101u…

Q: A naturally occurring element identified by the symbol 'X', has the following isotopic composition…

A: The question is based on concept of atomic mass calculations. we have been given percentage…

Q: To how many significant figures would you need to express the mass of an thorium-228 atom in amu to…

A: Isotopic mass of thorium-228 is 228.0287411 amu Rest mass of an electron in amu = 0.00054858 amu

Q: Refer to the periodic table and select the symbol of the element that fits each of the following…

A: 1) the fourth-period alkali metal : Since the first group elements are known as alkali metals. Hence…

Q: Identify the major difference and the major similarityamong isotopes of an element

A: Given information,   The major difference and the major similarity among isotopes of an element

Q: 8 C N 3 12 13 14 15 16 Transition elements Mg Al Si P 26 28 29 Fe Ni Cu 47 50 Ag Sn Questions and…

A: The question is based on periodic properties of the elements. we have been given certain elements.…

Q: Group the following elements according to similar properties: As, I, Ne, F, Mg, K, Ca, Ba, Li, He,…

A:

Q: Give the number of electrons in an atom of the isotope americium-246.

A: The answer to the following question is given as -

Q: Does any element with ZS 92 match the description? If you checked yes, give the symbol of an element…

A: Periodic table is the arrangement of elements in a systematic way based on their physical and…

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: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A:

Q: The symbol and atomic number of the lightest metalloid in Group 4A are:

A: Silicon (Si) is the lightest metalloid of Group lVA and its atomic number is 14.

Q: Which of the following statements is/are incorrect? Select all that apply. You may choose more than…

A: Answer: Here, only the last option is incorrect, other than that the rest of the options given about…

Q: 12, Which of the statements is not correct about the element germanium? Group of answer choices A,…

A: Germanium is an element with an atomic number 32. The germanium atom has 32 protons and 32…

Q: (c) Explain why the d block elements zinc and scandium are not transition elements. (

A: Sc and Zn both are d-block elements .

Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: Given that: Isotope Mass(amu) Relative abundance 98Ru 97.9 90.3% 99Ru 98.9 9.7%

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

A:

Q: Which of the following describes the element I? Choose all that apply. is very reactive as a…

A: I is very reactive non-metal (i is belong to group 17 . in group 17 all metal are non metal) I…

Q: What is the relationship between an isotope’s abundance in nature and an element’s atomic mass…

A: Isotopes are atoms of same elements which have same atomic number but different mass number.

Q: 11. Complete the following table by filling in the number of electrons in the last column and by…

A: