The uranium atom is the heaviest of the common naturally occurring elements but uranium is not the densest element. Explain how this is possible.

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 THREE elements are rare-earth elements? calcium neodymium rhenium niobium samarium thallium…

A: In the above question the elements which are rare earth metal  among the option provided are…

Q: Complete the following by placing the missing words correctly. The atomic theory was given by +.…

A: The answer to the following question-

Q: The number of neutrons in an atom determines the type of element it is

A:

Q: why the discovery of noble gases was late?

A: The discovery of noble gases was late.

Q: Define the term Neutron-to-Proton Ratio?

A: To find: The Definition of Neutron-to-proton ratio

Q: Which statement is true?(a) For a given element, the size of an isotope with more neutrons is larger…

A: For a given element, atoms having same atomic number with different mass number are known as…

Q: 66. Which element do you expect to be most like magnesium? Why?(a) potassium(b) silver(c) bromine(d)…

A: Magnesium = Its atomic number is 12, and present in Group 2 in the periodic table.

Q: 3. Explain the statement , Matter and radiation have “dual nature.”

A: The matter is that substance which has its own mass and occupies some space.Light or radiation are…

Q: Identify an element that would have similar properties as magnesium (Mg). Explain your choice and…

A: The element that has the similar properties like magnesium is -

Q: Variations in average atomic mass may be observed for elements obtained from different sources.…

A:

Q: Suppose that you face a problem similar to Mendeleev: You must predict the properties of an element…

A: The properties of an element are determined by the protons, neutrons and the electronic…

Q: An example of an element is chicken noodle soup powerade air inside a balloon lead pipe baking soda…

A: An element is a pure form of substance in which all atoms have same number of proton so here we see…

Q: (a) How many protons are found in one atom of selenium-80? protons (b) How many neutrons are found…

A:

Q: Each element: has unique physical properties O has unique chemical properties O is made of a single…

A: Element :- It is a pure substance consisting of same type of atoms that all have same number of…

Q: Which elements are most likely to have properties that are similar to the properties of F?

A: Br and Cl have the similar properties like Fluorine. Because F is the member of 17 group in the…

Q: 11) There are . 132 of Хе. 54 electrons, protons, and neutrons in an atom A) 132, 132, 54 B) 54, 54,…

A: Different elements have different number of electrons, protons and neutrons. Protons are subatomic…

Q: 86. the symbol for the atomic number is Z the United States has the largest water footprint of…

A: Given:  Q 86 to 95 for True or False Q 96 to 100 for Matching

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: Atoms with the same number of protons but with different electrical charges _____.

A: Electric Charge is two types.    Positive charge Cation and negative charge anions

Q: Atoms of a specific element that have the same number of protons but a different number of neutrons…

A: An atom is made up of protons, neutrons, and electrons. Protons and neutrons together called…

Q: 4.40 Two isotopes of rubidium occur naturally, Rb and Rb. Which isotope of rubidium is more…

A: Average atomic mass of Rb = 85.47 Let percentage abundance of 85Rb = x and percentage abundance of…

Q: Identify each of the following elements as a metal, nonmetal,or metalloid: (a) gallium, (b)…

A: Metals are those elements which show metallic properties like shiny appearance, ductile and…

Q: One isotope has an atomic weight of 408.5 atm and a percent abundance of 23.0% while the other…

A: To calculate the atomic weight of the element, multiple the percent abundance with respective weight…

Q: Identify each of the following elements as a metal, non-metal, or metalloid: (a) gallium, (b)…

A: In the periodic family: Metals exhibit electropositive character. Non-metals exhibit electronegative…

Q: The total mass of 12 protons, 27 neutrons, and 24 electrons

A: Given that, no. of proton = 12 no. of neutron = 27 no. of electron = 24

Q: 11. At death, a nobleman in ancient Egypt was mummified and his body contained 1.4 x 10 3 g of…

A:

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: what are 2 incompatible elements? are calcium and chlorine incompatible?

A: Rubidium, Barium, Uranium, and Lanthanum are incompatible elements.

Q: The vast majority of the ISM, both by volume and by mass, is made up of this element, found at many…

A: ISM means Interstellar medium. It consist of matter and radiation that exist between the spaces of…

Q: Timothy is studying atoms in school. He creates a chart Number to organize of information Neutrons…

A: We do have three sub atomic particles, namely electrons, protons and neutrons with " -1 ,+1 and 0 "…

Q: How are calcium and phosphorus related?

A: In comparison with calcium, plasma phosphorus exists in both organic and inorganic forms, including…

Q: noble gases are also considered to be rare gases. why?

A: Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are called rare gases…

Q: Complete the following by placing the missing words correctly. The atomic theory was given by…

A: The atomic theory was given by  Dalton. Protons is a  subatomic particle . The atomic number gives…

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: 44) Which has the highest sub energy level? a. K b. L c. M d. N

A:

Q: Which one of the following has as many electrons as it has neutrons? A) 19F B) 40C22+ C) 14C4- D}…

A: To find: Isotope which has the same number of electrons as the number of neutrons in it.

Q: an oxygen atom with 10 neutrons

A: An oxygen element is a non-flammable element and exist in various isotopes. For the same element,…

Q: Which pair of elements has the most similar properties? (a) Sr and Ba                (b) S and Ar(c)…

A: To determine the pair of elements that has the most similar property. (a) Sr and Ba(b) S and Ar(c) H…

Q: Group I (the alkali metals) includes lithium (Li), sodium (Na), and potassium (K). These elements…

A: Introduction The number of valence electrons (electrons which are located on outer energy level) of…

Q: what are the properties of cathode rays and anode rays?

A:

Q: Give the names and chemical symbols for the three isotopes of hydrogen.

A: The name and chemical symbols for the three isotopes of hydrogen has to be given,

Q: 92. The three most stable oxides of carbon are carbon monox- ide (CO), carbon dioxide (CO.), and…

A: Given the three oxides of carbon are as follows: CO CO2 C3O2

Q: The diagram represents an atom of beryllium. K (a) Complete the following statements by writing one…

A: The diagram of beryllium atom given is,

Q: In 1909, a team of British scientists led by Ernest Rutherford, carried out the Gold Foil Experiment…

A: Gold Foil Experiment helped to determine the arrangement of particles in the atom.

Q: halogen noble gas

A:

Q: Suppose that you face a problem similar to Mendelev: You must predict the properties of an element…

A: In the periodic table, the elements are arranged in order of their increasing atomic numbers. The…