Explain why the rows in the periodic table become progressively longer as we move down the table. For example, the first row contains two elements, the second and third rows each contain eight elements, and the fourth and fifth rows each contain 18 elements.

Q: The ionic radii of the ions S2–, Cl–, and K+ are 184, 181, 138 pm respectively. Explain why these…

A: The ions given are S2-, Cl- and K+. The number of electrons in all the species are same as the given…

Q: Which two of these elements would you expect to show the greatest similarity in chemical and…

A: The elements which are expected to show the greatest similarity in chemical and physical properties…

Q: Which of the following elements is the largest?   a barium b titanium c rubidium d sodium

A: Atomic size decreases across a period from left to right, while increases down the group.

Q: dentify the missing information for each atom or ion. Note that the atoms and ions are not…

A: 1) A.  Mass number of selenium, M = 76 Charge on Selenium C = -2 Atomic number of selenium Z = 34…

Q: How many valence electrons does each of the following atoms have? titanium, ? = 22 iodine, ? = 53…

A: Electrons are filled in a different atomic orbital in an atom. According to the Aufbau rule, the…

Q: Three sections of the periodic table are labeled A, B, and C in the image below. (IT CAN ONLY BE…

A: The portion of periodic table given is as shown below.

Q: Explain in a short paragraph what is happening in this graph show all your work.

A: The distance of the nucleus from the valence shell electrons is termed the atomic distance or…

Q: Which of the following pairs of elements have the most similar chemical properties?     O and N…

A: Elements that are present in same group have moat similar properties.

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

A:

Q: b) Calculate the number of protons, electrons and neutrons that the element Xy have. www. Protons=…

A: Given : For XyMetal  Number of electrons = 56  Number of protons = 56 Number of neurons = 44

Q: Which is the most massive (has highest mass)? An atom of oxygen A proton A molecule of hydrogen A…

A: A proton is a subatomic particle that is present in the nucleus of an atom. The number of protons…

Q: Identify these elements based on their locations in the periodic table. Give the symbol, not the…

A: The periodic table describes the arrangement of atoms by considering their properties and atomic…

Q: Read each description in the first column of the table below. If any chemical element with atomic…

A: Note: Group 1A to 8A all have atomic number ⩽92.  Group 1 and 2 constitute the metals: a). Group 1…

Q: Matter is comprised of All of the 98 elements that occur naturally have unique qualities that allow…

A: 1. atoms  2. Compound 3. atoms  4. Bonds  5. Interaction