3. What is the symbol for the element in group 7 and series 5? a. Nb b. Db c. Te . Bh e. None of the above

Q: Antimony (Sb) has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.21%…

A: Given: Isotope of Antimony (Sb)  % abundance  Sb-121.  57.21%.  Sb-123. 42.79%.

Q: You have discovered a new element - Bluehenium (Bl).  It has two naturally occurring isotopes 68Bl…

A:

Q: Potassium naturally consists of 93.10% K-39 and 6.9% K-41. Calculate the atomic mass for Potassium.

A: Given that, % abundance of K-39 = 93.10 % = 0.9310  % abundance of K-41= 6.9 % = 0.069  Then,

Q: g. What is the atomic number for potassium? h. What is the atomic mass for potassium? i. How is the…

A:

Q: 36. Which statement about protons is false?(a) Protons have about the same mass as neutrons.(b)…

A: An atom is made of three particles namely, protons, neutrons, and electrons. The protons and…

Q: Aluminum has 13 electrons, 13 protons and 14 neutrons a) What is its atomic mass? b) What is its…

A: The atomic number of aluminium is = 13 The number of protons in the aluminium is = 13 The number of…

Q: Selenium-80 is a naturally occurring isotope used in overthe-counter supplements.a. How many protons…

A: An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles…

Q: 10:51 1 l LTE [cK-12 License 13. The atoms in the air are called. , and they are very a. noble…

A:

Q: 17. Sergio's teacher gave him a sample of a substance to identify. His teacher told him it is either…

A: Metal are hard , shiny, magnetic , and a good conductor of electricity .

Q: How did Mendeleev come up with the first periodic table of the elements?   A:He estimated the number…

A: To explain: How did Mendeleev come up with the first periodic table of the elements.

Q: How did they describe atoms in around 450BC?

A: Democritus was the first person to give the concept of the existence of an 'atom'. He was a Greek…

Q: Because zinc has nearly the same atomic radius as copper(d=8.95 g/cm³), zinc atoms substitute for…

A: It is the fixed distance between the nuclei of two bonded atoms (like atoms or unlike).

Q: How many 7s electrons are in Ra?

A: The number of 7s electrons are in Ra has to be given,

Q: Does the Aluminum (Al) ion gain or lose electrons? a Lose because it is easier for Aluminum (Al) to…

A: Al have 13 electron and 3 electron in it's valence shell. It is element of boron family. Noble gas…

Q: Which of the following has the greatest number of electrons?   a. Ca2+   b. K+   c. Cl-   d. S2-…

A: Number of electrons in Ca2+ = 20 - 2 = 18 e- Number of electrons in K+ = 19 - 1 = 18 e- Number of…

Q: A certain element exists as three different isotopes, 29.1% of all the isotopes have a mass of 75.23…

A: The average atomic mass can be calculated by using Following formula - AAM = (Mass of 1st isotope×%…

Q: 04:- Who........ 1-Made the first real periodic table. na elements according to their propertie=…

A: We are authorized to solve only one question at a time. Please post the rest of the questions…

Q: How do you know that each element match up to their letter descriptions? I want a small explanation…

A: Names and Symbols of the ElementsEvery component has a name. A large number of these names are now…

Q: Explain how each scientist’s experiment contributed to the characterization of the atom (example:…

A: We have to explain each scientist’s experiment.

Q: 47. List the name and the atomic number of each element.(a) Mn(b) Ag(c) Au(d) Pb(e) S

A: The atomic number is the number of protons found in the nucleus of the atom of that element. Every…

Q: e.) Light travels 186 000 miles / second. How long is a light year in meters? (1 light year is the…

A: 3. e.) Given: Light travels 186 000 miles/second. First determine the number of seconds value in one…

Q: What is the charge on the electron, the proton, and the neutron, respectively? a.-1, +1, +1 b. -1,…

A: Write charge and mass of electron, proton and neutron ---

Q: Which group of three elements contains a transition metal, a halogen, and noble gas? a) S, I, Cu b)…

A: Since the Halogen elements are F, Cl, Br, I, At And noble gases are He, Ne, Ar, Kr, Xe, Rn

Q: match it's meaning

A: A . NOBEL GASES--------3 CONTAIN ELEMENTS IN ALL STATE OF MATTER  AT ROOM TEMERATURE C.…

Q: 24.1% of all isotopes of an element have a mass of 75.23 amu. 48.7% have a mass of 74.61 amu and…

A:

Q: 9. What observations in the gold foil experiment made Rutherford conclude that atoms are mostly…

A: 9. The answer is option no. (B) Most alpha particles passed through the gold foil undeflected. 10.…

Q: A hypothetical element, X, has two isotopes: 47X with an isotopic mass of 47.621 amu and 51X with an…

A: The atomic mass of the element can be calculated as,

Q: List the all elements and total of atoms 1. Ba(PO4)2  2.Zn(OH2)

A: Molecules are formed by two or more than two atoms .  Molecules are may be diatomic , triatomic or…

Q: 13. 9.62 g of an element contains 0.240 mol. Identify the element. А. В В. Не С. Са D. Zr E. Both Ca…

A: Weight of an element = 9.62 g No. of moles = 0.240 mol

Q: Skeich. diprem in diatm S-Poocess barth faom 14° Ce Specfy tbe of earch bebacesys (lies neutron > Eo…

A:

Q: . In the following figures, the open circles represent atoms of an element and the filled circles…

A: Dalton’s Atomic Theory: Dalton's Atomic Theory is based on law of conservation of mass and the law…

Q: 46. The diagram at the right represents two adjacent atoms of sulfur. The measure ôf distance o yasl…

A: As per rule only the first question can be answered: Solution to Q 46) The covalent radius of S (rS)…

Q: 11. What was Rutherford's contribution to the atomic model? A. Electrons are not bound to the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

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: an unknown halogen has a mass of roughly 160 g at standard temperature and pressure.  Which is the…

A:

Q: In a sample of any metal, spherical atoms pack closelytogether, but the space between them means…

A: (a) The mass of an Iridium atom is 192.22 amu. The radius of an Iridium atom is 1.36 A. Consider the…

Q: Which pair correctly matches an element to its atomic number? O a) 9.012 - Be O b) 12.01 - C c)…

A: The atomic number of an element is equal to the total number of protons in the nucleus of the…

Q: Fill in the empty cells. Isotopic Symbol Element atomic Symbol number mass # of # of # of number…

A: Atom consist the mainly three sub atomic particles, that are electron, proton and neutron. Electron…

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

A:

Q: d. A sample of potassium atoms is made up of 54% 39K and 46% 41K. Use this information to find the…

A:

Q: 1. A solid circular cone made of pure platinum (d = 21.45 g/cm3 ) has a diameter  of 2.75 cm and…

A:

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: 12C and 14C area. atoms of different elements.b. isotopes.c. atoms with different atomic numbers.d.…

A: Given substances are : 12C and 14C  Options are : a. atoms of different elements.b. isotopes.c.…

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

A:

Q: 2. An element that has 9 orbitals 5 fully filled, 2 single electrons and 1 empty orbital (a) What is…

A: f) Mg is a metal and can easily lose two electrons. It have properties similar to group 2 elements…

Q: Nitrogen (N), has two naturally occurring isotopes: N-14 that has a percent abundance of 99.63 % and…

A: The atomic mass of Nitrogen = ( mass of N-14 X percent of N-14 + mass of N-15 X percent of N-15) /…

Q: 70 Zn 30

A: The atomic number of an atom is the number of protons present in the atom. For a neutral atom, the…

Q: 23 A student tests the properties of an element and finds that it is malleable, shiny, and conducts…

A: The metals are hard, can be beaten into sheets, can be drawn into wires, shiny, sonorous, etc. A…

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