Science

Unit 3 Periodic Table Remediation

Group 2 elements like Be, Mg, ... are called alkaline earth metals. They exhibit similar chemical properties. Which of the following characteristics is responsible for the common chemical behavior of elements in any group of the periodic table?
the same number of electrons in the outermost energy shell of their atoms
the same number of electrons
the same atomic size
the same electronegativity

Considering the element with atomic number 4 and atomic number 9 on the periodic table. Give the reason(s)/cause(s) for these elements to be different in a) reactivity, b) forming ions, and charges of these ions. (4 points)

The group of elements characterized by needing only 1 electron to fill their valance shell are the _______
transition metals
alkali metals
halogens
noble gases

The work of Henry Moseley led to a rearrangement of the periodic table originally created by Dmitri Mendeleev. Moseley's new arrangement successfully predicted the presence of undiscovered elements. Moseley's arrangement of the periodic table was based on the properties of elements and ____
increasing atomic number
decreasing atomic number
increasing mass number
decreasing mass number

An element contains 15 protons, 18 electrons and 17 neutrons. What is the identity of this element?
phosphorus ion with 3- charge
phosphorus atom
chlorine ion with 1- charge
chlorine atom

An element is dull, is poor conductor of heat and electricity and needs one electron to complete its valence shell (outermost energy level). This element most likely belongs to which of the following groups?
the alkali metals, Group 1
the alkali metals, Group 2
The halogens, Group 17
The halogens, Group 18

Which statement best describes the two atoms in the chart below?
Atom X and Z are cations
Atom X and Z are elements in the same group
Atom X and Z are isotopes of the same element
Atom X and Z have the different number of valence electrons

Which of the following is most likely to ionize by losing two electrons?
Magnesium
Hydrogen
Lithium
Oxygen

Which of the following groups of the periodic table is the least reactive?
Group 1
Group 2
Group 13
Group 18

Order the following from the greatest electronegativity to the least electronegativity: S, O, Se, Te
O > S > Se > Te
Te > Se > S > O
S > O > Se > Te
O > Te > Se > S

Using the diagram below and answer ALL of the following questions: 1) What is the element X? 2) What will element X do to become an ion? 3) What will be the charge of ion X?

The element with the lowest electronegativity is found in the:
Upper left-hand corner of the periodic table
Lower left-hand corner of the periodic table
Lower right-hand corner of the periodic table
Upper right-hand corner of the periodic table

The atomic numbers of some elements A, B, C and D present in the modern periodic table are 4, 18, 20, and 12 respectively. Choose the elements that belong to the same period.
A & C
A & D
B & D
B & C

Aladdin goes to a cave to get his lamp. The ghost at the cave asks him to name the "metal" which exists in the liquid state at room temperature. Help Aladdin to name a metal that exists in the liquid state at room temperature.
Bromine
Gallium
Mercury
Sodium

Which of the following accurately identifies the difference in reactivity between alkali and alkaline earth metals?
Alkali metals are more reactive because they lose one electron
Alkali metals are less reactive because they gain one electron
Alkaline metals are more reactive because they lose two electrons.
Alkaline metals are less reactive because they gain two electrons

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  1. plz help on this :(((

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  2. trust me i just took the test its
    A
    C
    D
    B
    B
    A
    C
    C
    D
    A
    B
    C

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  3. That's not very helpful. I need more than that

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