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chem 3 awais 8
Question | Answer |
---|---|
All of the following elements are metals except | Chlorine |
The second row of the periodic table includes elements | 32 |
is an unreactive elements | Helium |
Which of the following is a transition elements? | Nickel |
All of group 1 elements have | one valence electrons |
Each row in the periodic table ends with a | noble gases |
In going from left to right in any given row in the periodic table the size of the atoms generally | decrease |
Compared to the neutral atom from which it is derived, a negative ion is | Always larger |
Which elements has the largest atomic radius? | Al |
Which elements has the smallest radius? | Cl |
Which elements has the lowest first ionization energy? | At |
Which elements has the highest first ionization energy? | Ar |
Which ion has the largest radius? | Na+ |
Which elements has the lowest electronegativity? | Cs |
Which element has the higest electronegativity? | N |
Fluorine, Bromine, or iodine is | Halogens |
An element found in group 1 of the periodic table is | Alkali metals |
In compound, has an oxidation number of 2+ is | Alkaline Earth metals |
Sodium or cesium | Alkali metals |
In compounds, has an oxidation number of 1- | Halogens |
An elements found in group 17 is | Halogens |
Magnesium or barium is | Alkaline earth metals |
In compound, has an oxidation number of 1+ is | Alkali metals |
An elements found in the group 2 is | Alkaline earth metals |
Is harder and denser than its alkali neighbor | Alkaline earth metals |
Strontium, which is identified by the red color of fireworks is | Alkaline earth metals |
Astatine is the largest of this family is | Halogens |
Luster is | Metals |
Tightly held valence is | Nonmetals |
At the right side of the periodic table is | Nonmetals |
semiconductors is a | Metalloids |
Good conductors of electricity is | Metals |
Usually quite brittle is | Nonmetals |
Properties intermediates between metals and nonmetals | Metalloids |
A variety of colors is | Nonmetals |
Three to eight valence electrons is | Nonmetals |
Poor conducators of heat is | Nonmetals |
Hydrogen | Has only one electron |
First period | Contains two elements |
Second period | Contain eight element |
Group 2 element | Have two valence electrons |
Magnesium | Has one more electron than sodium |
Oxygen | has six valence electrons |
Noble gases | Are very unreactive |
Transition elements | Have unpredictable properties |
Metals | Have loosely bound valence electrons |
Nonmetals | Tend to gain electrons in chemical reactions |
A Lewis electrons dot structure shows the total number of electrons in the atom of an elements. | False its valence electrons |
The electrons dot structure for a metals is likely to have one, two, of three electrons. | True |
An element with an electron dot structure containing only one electron is likely to be found in the group 7 of the periodic table. | False Group 1 |
Why do elements in the same group period have properties that are different from one another? | Because the number of valence electrons increase as you move from left to right across the period. |
How does the size of an atoms change when it loses electrons to become a positive ion? | It gets smaller more pull on remaining electrons is stronger (more protons). |
How does the size of an atom change when it gains electrons to become a negative ions? | It gets smaller less attraction because there are more electrons added. |
At room temperature, what state (solid, gas, or plasma) are the majority of the elements in on the periodic table? | Solid |
Are most elements metals, nonmetals, or metalloid? | Metals |
Elements that have the same number of act in similar ways? | Valence electrons |
What is the purpose of the zigzag line on the periodic table? | Transition between metals and nonmetals. Elements on the line have properties of both. |
Which metals family is considered the most reactive? | Alkali metals |
Which nonmetals family considered most reactive? | Halogens |
Which family is considered the most stable? | Noble gases |
What are synthetic elements? | An elements that doesn't occur naturally on earth, but can be created artificially. |
Metals: | Luster, conduct heat and electricity, malleable, ductile, lose electrons in the reaction, valence electrons, held loosely, solids room temperature, high melting points. |
Nonmetals: | Poor conductors of heat and electricity, lower melting point, tightly held valence electrons, tend to gain and share electrons in reaction. Gases and room temp. |
Metalloids: | Properties of both metals and nonmetals, some are semiconductors 3-6 valence electrons. |
Electronegativity | Attraction for bonding electrons. --------------> from left to right it's increase ->decrease. From top to bottom it's decrease |
Ionization energy | Energy required to remove electrons From left to right it's increase, and from top to bottom it's decrease. |
Atomic Radius | Radius of atoms, describe the size of atoms. From left to right it's decrease, and from top to bottom it's decrease. |
Reactivity Metals | Reactivity from highest to lowest. From left to right it's decrease, and from top to bottom it's increase. |
Reactivity Non Metals | An elements incaple of forming simple positive ions in solution. From left to right it's decrease, and from top to bottom it's increase. Reason: How easily electrons can be removed or attracted. |
The mordern periodic table is arranged according to it's | atomic number |
The period number of an elements is the same as the ---------- of it's outermost level. | Number |
The --------- electrons of an elements in the second period, for example are in the ---------- second energy level. | Valence, second |
A period 3 elements has its valence electrons in the --------- energy level. | three |
The number of valence electrons changes from ---- to ---- as move left to right across a period for main group elements (skipping the transition elements). | 1 to 8 |