Science Chapter 5

An electron that is in the highest occupied energy level of an atom is ...?

The reactivity of alkali metals does what from the top of Group 1a to the bottom

Sodium is stored under oil because why?

The differences in reactivity among alkaline earth metals are shown by the way they react with what?

What is the main ingredient in limestone?

What helps build strong bones and teeth?

What are the four metals in Group 3A?

What is the most abundant metal in the Earth's crust AND is a good conductor of electric current

What are the two metaloids in Group 4A?

Except for water, most of the compounds in your body contain what element?

What are the non metals in Group 5A

Name two elements in the nitrogen family that are contained in fertilizer?

List the three non metals in group 6A

Name the most abundant element in the earth's crust?

List the four non metals in Group 7A

Halogens have ________ properties but different ___________ properties.

Name three characteristics of noble gases

How can an element that does not react easily with other elements be useful?

Is it true or false that the first elements to be identified were gases?
True False

As the number of known elements grew, so did the need to organize them into groups based on their what?

What categories of elements did French chemist Antoine Lavoisier use to classify

Is it true or false that Mendeleev needed to organize information about 63 elements?
True False

Mendeleev's strategy for classifying elements was modeled on what?

What type of information did Mendeleev know about each element?

How did Mendeleev arrange the elements into rows?

Is it true that a periodic table is an arrangement of elements in columns based on a set of properties that repeat from row to row?
True False

Menedleev published the table he made in 1872. Why did he leave some locations in his periodic table blank?

Which of the following elements have similar properties?

gallium
scandium
germanium
aluminum

In the modern period table, elements are arranged by increasing number of what?

Explain why the number of elements per period varies.

Properties of elements repeat in a predictable way when atomic numbers are used to arrange elements into groups. What is this pattern of repeating properties called?

What is atomic mass

How many protons and neutrons does Carbon-12 have?

What is used as the standard for comparing the masses of atoms?

How is an atomic mass unit defined

Is it true or false that most elements exist as a misture of two or more isotopes?
True False

Is the mass of an atom of chlorine-37 greater or less than the mass of an atom of chlorine-35?

Is it true or false that all values are equally important in a weighted average?
True False

Name the three categories into which elements are classified based on their general properties

Do all metals react with oxygen in the same way?

What is an important property of transition elements?

Are nonmetals good conductors of heat and electric current

Are many nonmetals gases at room temperature

Are all non metals extremely reactive ?

Nonmetals that are solids tend to be what?

Across a period from left to right, the elements become ____ metalic and more ________.

Which of the below period 3 elements below are highly reactive?

sodium
chlorine
silicon
argon