CHY 104 Lecture Notes - Lecture 2: Boron, Unified Atomic Mass Unit, Carbon Disulfide

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magentarat171

20 Nov 2016

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Symbols & formulas: a unique symbol is used to represent each element. Elemental symbols: a symbol is assigned to each element. The symbol is based on the name of the element and consists of one capital letter or a capital letter followed by a lower case letter. Some symbols are based on the latin or german name of the element: chemical elements & their symbols. Elements from group 7a: compound formulas, a compound formula consists of the symbols of the elements found in the compound. Each elemental symbol represents one atom of the element. If carbon disulfide contains one atom of carbon for every two atoms of sulfur, what is the chemical formula for carbon disulfide: answer: cs2, atomic structure, atoms are made up of three subatomic particles: protons, neutrons, and electrons. The protons and neutrons are tightly bound together to form the central portion of an atom called the nucleus.

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Place the elements in their proper position on the periodic table. To make this more challenging. I have not included their identities. Instead of the usual chemical symbol, each element is represented by a code letter. Some clues to the element's identities are listed below. In addition, the elements fall into these families or groups.

JKQ, WNVG, IAL, EPFZ, YBR, ODS, CXU, THM

Place each code letter in its proper space in the table below. Indicate the actual chemical symbol that corresponds to each letter.

V is an inert gas

E is an alkali metal

U is a halogen

D is in family VA

J is an alkaline earth metal

T is in family VIA

R has one less proton than A

A has six protons in its nucleus

R has an atomic number one more than J

O has an atomic number one more than A

S has 8 more protons in its nucleus than D

F has only one proton in each atom

Y has atoms that are larger than the atoms of B

I has the largest atomic number in its group

T is found in the fourth period

C has atoms that are larger than those of U, but smaller than those of X

V has one more proton in its nucleus that U

H has the smallest atomic number in its family

G has two protons in each atom

N is a third-period element

Q has an atomic mass greater than that of J and less than that of K

E has an atomic number less than that of Z, but greater than that of J

Z has more protons than other elements in its family

U is found in the second period

cyangnat561

Which of the following are true? [check all that apply] Ternary salts are compounds that result from replacing the hydrogen in a ternary acid with metal ion or ammonium ion. Ternary compound consists of two elements. Most transition metals and the metals of group 3A (except Al), 4A, and 5A exhibit more than one oxidation state, thus, they may form two or more binary compounds with the same nonmetals. Ternary acids are compounds of hydrogen, oxygen and (usually) a metal. Nearly all binary molecular compounds involve two nonmetals bonded together. Prefix tetra- represents the number five. Binary compound consists of two elements. To name binary compound, the less electronegative element is named first and the more electronegative element is named second. Binary acids arc compounds in which H is bonded to a group 6A element other than that O or to a group 7A element. To name binary ionic compounds which contains metal cations and nonmetal anions, the anion Is named first and cation

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CHY 104 Lecture Notes - Lecture 2: Boron, Unified Atomic Mass Unit, Carbon Disulfide

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