2.105 For the noble gases (the Group 8A elements) ¿He, 10Ne, 18 Ar, Kr, and Xe, (a) determine the number of protons and neutrons in the nucleus of each atom, and (b) determine the ratio of neutrons to protons in the nucleus of each atom. Describe any general trend you discover in the way this ratio changes with increasing atomic number.

Q: An atom of calcium is represented by 12C.. How many neutrons are in the nucleus of this atom?…

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Q: Which of the following sentences are correct? 1. Atomic mass is the weighted average of the masses…

A: The mass number or atomic mass can be estimated by its various isotopes present in nature and their…

Q: 1. Which of the following substances is an element? А. Ice В. Coal С. Sand D. Iron 2. Which of the…

A: The structure of an atom, as studied by scientist such as J. J. Thomson, Ernest Rutherford and Neils…

Q: The isotopes of bromine have the following relative abundances 79Br = 50.5%,  81Br = 49.8%  State…

A: Isotopes of a same element could be in two or more forms having same atomic number but different…

Q: Which best describes isotopes? A. Same number of neutrons, different number of electrons B. Same…

A: atoms of the same element have the same number of protons, but some may have different numbers of…

Q: Write the isotopic symbols in the form X-A (for example, C- 13) for the iodine isotope with 74…

A: Write the isotope for iodine with 74 neutrons

Q: Consider (a) an atom with 20 protons, 20 electrons and 20 neutrons, (b) an atom with 20 protons, 20…

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Q: For heavier nuclei (Z > 40), which of the following describes the relative number of protons and…

A: Heavier nuclei have atomic number greater than 40. We are given the graph of Number of…

Q: Write the isotopic symbols in the form X-A (for example, C- 13) for the argon isotope with 22…

A: When the two Two has same no of proton but mass no is different then they are called is isotope of…

Q: Which statement about the three fundamental particles is false? O a. The charge of a proton is equal…

A: Electrons, protons and neutrons are considered as fundamental partials of atom

Q: The following is a model of a nucleus. The protons are represented by + signs, the neutrons are…

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

Q: How many protons, neutrons and electrons are there in a neutral atom of the isotope of antimony…

A: Number of protons = atomic number   Number of electrons = atomic number(in case of neutral atom)…

Q: Give the nuclear symbol (isotope symbol) for the isotope of bromine, Br, that contains 46 neutrons…

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Q: Complete the following table. (Remember to use correct capitalization for the chemical symbol!)…

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Q: Iron exists in nature as a mixture of predominantly three isotopes: 5426Fe (53.94 amu), 562.Fe…

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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: Suppose we have three hypothetical atomic nuclei: A, B, and C. Nucleus A has 3 protons and 4…

A: According to the question, we have three hypothetical atomic nuclei:A, B, and C. Nucleus A has 3…

Q: How many protons and how many neutrons are there in a nucleus of the most common isotope of (a)…

A: Number of protons = atomic number  Number of neutrons + number of protons = mass number  So,…

Q: Which of these statements is an accurate description of an atom of potassium-40? O It is an isotope…

A: To determine which of the given statement describe the potassium-40  It is an isotope with 40…

Q: following statements below correctly describes isotopes?  a. They are of the same number of neutrons…

A: Atomic number = number of protons  Mass number = number of protons + number of neutrons

Q: 3. A) Boron, element number 5, exists in only two common stable isotopes. They are B-10 and B-11.…

A: A) Given : There are only 2 naturally isotopes of boron i.e B-10 and B-11. The average atomic mass…

Q: What are the number of protons, neutrons, and electrons in the following isotopes? Part C Express…

A: Number of protons (Np) = Number of electrons (Ne) = Atomic number   Number of neutrons (Nn) = Atomic…

Q: Explain the following statement: The smallest particles unique to an element may be atoms or…

A: An atom is formed of three main sub-particles namely, electrons, protons, and neutrons. Protons and…

Q: Three of the isotopes of Tellurium, Te, have mass numbers of 124, 126, and 130. Tellurium-124 has 52…

A: Isotope label is same as isotope notation and is written as follows: Xnm  is the isotope label where…

Q: Which answer is an example of the law of multiple proportions? Explain.a. Two different samples of…

A: Law of multiple proportions states that when two elements combine with each other to form more than…

Q: Copper has two isotopes, 63Cu and 65Cu. If the atomic mass of 63Cu is 62.93 and is found 68.95% in…

A: Given : There are only 2 naturally occurring isotopes of copper. Mass of Cu-63 = 62.93 amu Mass of…

Q: an element has 12 protons. what is its symbol?

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Q: A positively charged particle in the nucleus of an atom is    A. an electron    B. a neutron…

A: A positively charged particle in the nucleus of an atom is given below

Q: Which one of the following is the chemical symbol of an atom with 17 protons and 20 neutrons?

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Q: Which of the following statements about subatomic particles are true, and which are false? Drag the…

A: Any atom is made up of 3 subatomic particles. 1) electron  2) proton  3) neutron

Q: Which of the following statements is false? a. The proton and neutron are primarily responsible for…

A: we have to select the false statement

Q: 12. Naturally occurring iodine is iodine-127. Medically, radioactive isotopes of iodine-125 and…

A: A. )  Isotopes: The Elements with same atomic number but different mass number are called as…

Q: Which statement about isotopes is false? O Radioisotopes are unstable and spontaneously emit…

A: Isotopes are atoms which have same atomic number but different mass number.so isotopes have same…

Q: 1. (a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic…

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Q: 2. Which of the following best describes an element? a. A neutral substance consisting of a cation…

A: Element is a substance which consists only of atoms having same atomic number and hence same…

Q: Elemental boron is composed of 2 isotopes, boron-10 and boron-11  (A) how many  protons and neutrons…

A: (A) Isotopes are the atoms of same element having the same atomic number. They have the same number…

Q: 1. An atom of Potassium has a mass number of 39 and an atomic number of 19. a. Fill in the below…

A: Note: according to the rule I can solve first three part of the question. For another part please…

Q: Which is the explanation for the difference between the two isotopes of carbon, C-12 and C-14? a.…

A: Concept: Isotopes are the element of the same species that have the same atomic number but differ in…

Q: Fill in the blank spaces below. Isotope Symbol Mass Number Number of Protons Number of Number of…

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Q: Currently, the atomic mass unit (amu) is based on being exactly one-twelfth the mass of a carbon-12…

A: The mass of an atom is not only due to the sum of the masses of the neutrons, protons and electrons…

Q: What is the name of this element, and how many protons and neutrons does this isotope have in its…

A: The objective of the question is to write the name of the given element and to find the number of…

Q: Given that the atomic mass of aluminum is 26.98 grams, which of the following isotopes would you…

A: We have to predict the most abundant isotope.

Q: Which statement (s) below about isotopes of the same element is True? I. They have the same number…

A: Isotopes are the elements that have same atomic number but different mass number.    Chemical symbol…