Elements in Group 7A are known as the A) alkaline earth metals B) alkali metals C) chalcogens E) noble gases D) halogens

Q: Explain the important distinctions between eachpair of terms:(a) cathode rays and X-rays(b) protons…

A: Hi, since you have posted questions with multiple subparts. We will answer the first three subparts…

Q: Calculate the average atomic mass of Ga. Naturally occurring Ga is composed of 60.0% 69 Ga, that has…

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Q: why the discovery of noble gases was late?

A: The discovery of noble gases was late.

Q: Magnesium is located in on the periodic table. O d-block O s-block O p-block

A: For an element, If the differentiating electron (last electron) enters into s-orbital, then the…

Q: Element Atomie Ups electrons symbol Element Name Mass of number Feutrone number protons 31 15 19 20…

A: This problem is related to the element name their symbol and atomic number, mass numaber, number of…

Q: An element 'A' contains 4 protons, 4 electrons and 5 neutrons. it is + 1. It becomes when it has 4…

A: For a neutral atom, the number of electrons or protons is equal to its atomic number. The mass…

Q: 4. Two elements are studied. One has atomic number X and one has atomic number X- 2. It is known…

A: Two elements are studied. One of the element X belongs to alkali earth metal. The other element has…

Q: Determine whether each of the following statements is trueor false. If false, correct the statement…

A: An atom is the “smallest unit in an element”, this was until the discovery of the sub-atomic…

Q: Discuss Neutron-to-Proton Ratio?

A: In an atom, the atomic number indicates the number of protons present in an atom of an element. The…

Q: Copper has two natural isotopes: Cu63 and Cu-65. Which isotope is more abundant? (Hint: Refer to the…

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Q: How many protons and neutrons are in the naturally-occuring isotope Selenium-80? How do I solve…

A: Atomic number (Z) is defined as number of protons present in an atom.  In a neutral atom number of…

Q: Which of the following elements would be classified as a nonmetal? a.) silicon  b.) francium c.)…

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Q: 2.90 grams of phosphorus is burned in the presence of oxygen and forms 5.14 grams of a phosphorus…

A: We can just subtract the mass of the phosphorus from the mass of phosphorus oxide and get mass of…

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: Most elements are classified as _____. a.) metalloids b.) noble gases c.) metals d.) nonmetals

A: There are many elements in the periodic table with differing physical and chemical properties. Some…

Q: 21. The elements in Group 7A are known by what name? A. transition metals B. halogens oli m D.…

A: Group 7A of the periodic table consists of the elements: fluorine (F), chlorine (Cl), bromine (Br),…

Q: 6. What is electrical charge?

A: The definition of electric charge has to be given,

Q: Choose all of the following that apply to oşmium, Os. a. Metalloid b. Alkali metal Oc. Transition…

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Q: Questions 21 and 22: From the information given in the following tables, fill in as many blanks as…

A: The number of protons and electrons in a neutral element is always equal. The atomic number of an…

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: Element Mg AI si Þ S CI Ar ATOMIC 12 13 14 15 17 18 Configuration

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Q: Suppose a new element is found on an extraterrestrial planet, element J. Element J consists of two…

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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: This group of elements is the most reactive of all the non-metals  A) rare earths B) halogens C)…

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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: Which of the statement is false? O potassium is an alkaline earth metal. O Lithium is an alkali…

A: Given : Statement  To find : False statement

Q: 20) Cu²+is an ion of copper. How many nucleons and charged particles are present in the ion? A.…

A: Nucleon is the collective term for protons and neutrons. Nucleons are the particles found in the…

Q: What is the most common ion of Lithium? How many neutrons does it have?

A: Most common ion of lithium = ?  Number of neutrons in this ion = ?

Q: The ion with 91 electrons, 148 neutrons, and a 4+ charge

A: Given: No. of electrons = 91 No. of neutrons = 148 Charge = +4

Q: element is 5 X 24 Which a chromium b) germanium iron D) barium

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Q: Calucate the atomic mass: Titanium: Ti-46 (7.9 %), Ti-47 (7.3 %), Ti-48 (73.9 %), Ti-49 (5.5 %),…

A: Given data : Ti-46 = 7.9 % Ti-47 = 7.3 % Ti-48 = 73.9 % Ti-49 = 5.5 % Ti-50 = 5.4 %

Q: MCQ 17: By chemical means, chemical elements cannot be broken down into A. metals B. non-metals C.…

A: Element is the pure substance that contains atoms of single type.

Q: The element gallium has two naturally occurring isotopes, gallium-69 (68.9256 amu) and gallium-71…

A: Given , two isotopes of gallium (Ga) are 69Ga = 68.9256 amu 71Ga = 70.9247 amu  Let, % abundance of…

Q: Explain how Dalton’s atomic theory accounts for the law of conservation of mass?

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Q: In the formula Al2Se3, what is the charge of the Aluminum and the Selenium?

A: First of all let us analyze the given structure of Al2Se3. The structure has two atoms of aluminium…

Q: D. List down 5 noble gases E. List down eight transition metals F. Aside from the noble gases, list…

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Q: The radius of a Niobium atom is 143 pm(b) The mass of a single niobium atom is 1.54×10-22 g. Suppose…

A: Given here,the radius of a Niobium atom is = 143 pm1 pm = 1e-12 m1 m = 100 cmSo,Diameter of 1…

Q: Isotope name atomic # mass # # of protons # of neutrons # of electrons thorium-232 thorium-229…

A: Atomic no. = No. Of protons = No. Of electrons No. Of neutrons = mass no. - no. Of protons

Q: Practice %23 %23 Element Symbol Charge +, 0, - Protons Neutrons electrons Carbon-13 Hydrogen-2 1 Не…

A: An element is represented as ZSymbolM The no. Of protons is equal to the atomic number(Z) of any…

Q: What is the abundance of beryllium-10 ?

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

Q: In nature, the noble gases exist as A the sulfides B) the gaseous fluorides c) monatomic gaseous…

A: There are 6 naturally occurring Noble gas elements: He, Ne, Ar, Kr, Xe, Rn

Q: D. Guide Questions 1. What are metalloids? Enumerate the elements considered to be metalloids. 2.…

A: What are metalloids

Q: Boron occurs naturally as 10B and 11B. Which isotope is most abundant? (Refer to the Periodic…

A: Isotopes are atoms with the same number of protons, but differ in numbers of neutrons   Boron (5B)…

Q: Isotopic Symbol electrons Format: X-# Element atomic # of # of # of mass Symbol number number…

A: There are different type of elements with Their different symbols. Some symbols derived from their…

Q: A helium atom consists of two protons, two electrons and Iwo neutrons. In the helium atom, the…

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Q: Boron consists mainly of 19.9% boron-10 and 80.1% boron-11. What is the average atomic mass (amu) of…

A: The average Atomic Mass of Boron is given by -

Q: Which of the following is the least reactive group of elements? a. Alkali metals…

A: The least reactive group of elements has to be identified