(a)
Interpretation:
The radio isotope element should be identified which is used for the cancer treatment.
Concept Introduction:
Isotopes: Elements have same
(b)
Interpretation:
The greatest density of the element should be identified.
Concept Introduction:
Density:
The nuclear density can be calculated from the size of the nucleus. The nucleus density is based on the number of protons and neutrons.
(c)
Interpretation:
The element should be identified which is not found in nature.
Concept Introduction:
The first 92 elements occur naturally, Technetium (atomic number 43) and promethium (atomic number 61) were synthesized by chemist before identified in nature.
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Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
- Elemental analysis of a compound with molar mass 342.3 g/mol gives the following mass percent composition: C 42.11%, H 6.48%, O 51.41%. Find the molecular formula of the compound. Enter your answer in the space below using the following format: if the molecular formula of a compound containing elements X, Y, and Z is X2YZ3Â enter your answer as X2YZ3.arrow_forwarda) Identify the following as element (atomic or molecular), compound or mixture. b) Explain your reasoning and draw a sample of these substances containing 5 particles of that particular material. c) What would be the mass of 5 particles of that particular material? Show your work! H20 N2 C2HSOH Iodine gasarrow_forwardArrange the elements Na, Si, and S in the order of(a) decreasing atomic radius.(h)increasing first ionization energy.arrow_forward
- According to chemist John Dalton, if one mole of nitrogen is combined with three moles of hydrogen to form one mole of ammonia (knowing that nitrogen, with an atomic number of 7, has an atomic mass of 14, and hydrogen, with an atomic number of 1, has an atomic mass of 1), then this compound will have an atomic weight (or molecular mass) of: 14 grams per mole (14 daltons) 17 grams per mole (17 daltons) 20 grams per mole (20 daltons) 22 grams per mole (22 daltons)Â 43 grams per mole (43 daltons)arrow_forwardAtoms A and B interact to form a compound, AB2. When measured, atom A has a partial negative charge and atom B has a partial positive charge. From this information, we can conclude what? Select only ONE answer choice. Note: - means "approximately equal to" , A > B means "A is greater than B" , and A B: AB2 is hydrophilic Not enough information to answer the questionarrow_forwardFor Be-10, find the: a.) mase defect (in grams)Â b.) binding energy in kilojoules per mole. mass proton= 1.00728 amu; mass neutron= 1.00867 amu; mass Be-10 = 10.013534679 amuarrow_forward
- Chlorine is an element with the symbol Cl. Draw and label atomic structure of chlorine indicating the number and locations of protons, neutrons and electrons in one atom of chlorine.arrow_forwardThe atomic mass of an element can be used to determine A) the chemical properties of the element B) the number of protons in the element C) the number of neutrons in the element D) the number of protons plus neutrons in the element E) both the number of protons and the chemical properties of the elementarrow_forward. Give the name of and symbol for an element with this number of valence electrons.a) 2b) 6c) 8arrow_forward
- Nitrogen’s atomic number is 7. Just from the atomic number, can you determine how many protons, neutrons, and electrons a nitrogen atom has and how many electrons are in its first and second electron shells? (Assume the atom is electrically neutral.)arrow_forwardElements have varying numbers of protons, neutrons, and electrons.True or false?arrow_forwardWhat if there are a different number of Neutrons? Sometimes elements have a different number of neutrons than usual, so therefore have a different atomic mass. This is what we call an Isotope (a variant form of an element which has the same number of protons but a differing number of neutrons). Sometimes we’ll see Isotopes labeled with their new mass like this: 14C = this is Carbon 14. Notice it has a different mass than what is on your periodic table The average mass of all the isotopes is defined as an element’s Atomic Weight. Can you answer questions about these Isotopes? ELEMENT ATOMIC MASS NUMBER OF PROTONS NUMBER OF NEUTRONS 14C A  B  C 15N D  E  F 2H G H I Use your table to look up the number of protons, remember that never changes!arrow_forward
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning