Intro To Chemistry: Question Preview (ID: 27279)

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Mendeleev created the first periodic table by arranging elements in order of
a) increasing atomic mass b) decreasing atomic mass c) increasing atomic number d) increasing melting points and densities
The atomic number of an element is based on the
a) number of protons in its nucleus b) mass of its nucleus c) number of electrons around its core d) number of neutrons in its nucleus
From an element's location in the periodic table, you can predict
a) its properties b) its chemical name c) its chemical symbol d) when it was discovered
The two most common alkaline earth metals are
a) Calcium and magnesium b) sodium and potassium c) iron and silver d) copper and zinc
At room temperature, more than half of the nonmetal elements are
a) gases b) alloys c) liquids d) solids
The elements that do not ordinarily form compounds are
a) Noble gases b) metals c) halogens d) elements in the carbon family
Which is a property shared by most molecular compounds?
a) low melting point b) high boiling point c) high melting point d) nonpolar bonds
When an atom loses an electron, it becomes a
a) positive ion b) negative ion c) neutral ion d) neutral atom
Magnesium bromide is an ionic compound with the chemical formula MgBr2. (the 2 should be a subscript) What does the '2' tell you?
a) There are two bromide ions for every magnesium ion b) Bromide has a -2 charge c) There are two magnesium ions to every bromide ion d) Bromide has a +2 charge
In the chemical formula for an ionic compound, which item is written first?
a) The name of the positive ion b) the name of the negative ion c) the subscripts d) the charges
The chemical name for the compound with the formula Na2S is (the 2 is a subscript)
a) sodium sulfide b) lithium oxide c) sodium flouride d) magnesium sulfide
What is a double bond
a) two pairs of electrons shared between two atoms b) a bond between two atoms c) one pair of electrons shared between two atoms d) two pairs of electrons shared between four atoms
Electrons involved in bonding between atoms are
a) valence electrons b) inside the nucleus c) closest to the nucleus d) positively charged
What are two ways that a proton and a neutron are similar?
a) They are located in the nucleus and have an atomic mass of 1 b) They are located in the nucleus and have an atomic mass of 0 c) They are located in the nucleus and have a charge of +1 d) They are located in the nucleus and have a charge of zero
How is it possible for an atom to have no charge even though it is made up of protons, neutrons and electrons?
a) The number of protons and electrons are equal, therefore the charge is equal b) The number of protons and neutrons are equal, so the charge is equal c) The number of electrons and neutrons are equal, so the charge is zero d) None of these answers
Why is it UNnecessary to include the electrons when determining the mass of an atom?
a) The mass of the electron is so small that it wouldn't change the mass b) The electrons are not located in the nucleus, so they don't count c) The mass of the electrons is so large that it can't be added d) An electron has a negative charge
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