The Periodic Table

Question 1

Mendeleev gave the name "eke-aluminum to a(an)

Accepted Answer

unknown element predicted to have properties like aluminum

Question 2

which elements are all gases at room temperature?

Accepted Answer

Group 8A

Question 3

This element is an alkali metal. It is reactive and extremely soft, with an atomic mass of 23.

Accepted Answer

Sodium (Na)

Question 4

The elements within a __________ have similar properties.

Accepted Answer

group

Question 5

Who organized the first periodic table of elements?

Accepted Answer

Demetri Mendeleev

Question 6

This element is a halogen, solid at room tep with 6 valence electrons, and found on Venus.

Accepted Answer

Sulfur

Question 7

which of the following are the LEAST reactive nonmentals?

Accepted Answer

the noble gases

Question 8

What is the most abundant substance in the earth crust?

Accepted Answer

Silicon dioxide

Question 9

The usefulness of Mendeleev's periodic table was confirmed by

Accepted Answer

the discovery of elements with predicted properties

Question 10

The reactivity of alkali metals does what from top to bottom?

Accepted Answer

increases

Question 11

An electron that is in the highest occupied energy level of an atom is called (a)

Accepted Answer

valence electron

Question 12

Mendeleev predicted that the unknown element (eke-aluminum) would have what melting point?

Accepted Answer

High melting point

Question 13

Which of the following groups reacts heavily with water?

Accepted Answer

Alkaline earth metals

Question 14

differences in reactivity among the alkaline earth metals are shown by the ways they react with

Accepted Answer

water

Question 15

Across a period elements become

Accepted Answer

less metallic

Question 16

Isotopes of an element have different numbers of

Accepted Answer

neutrons

Question 17

Mendeleev's decision to leave gaps in the periodic table was supported by the discovery of

Accepted Answer

gallium

Question 18

Which of the following is NOT a use for calcium?

Accepted Answer

clay bowls

Question 19

Copper is an example of

Accepted Answer

a transition metal

Question 20

Fertilizers often contain which of the following elements?

Accepted Answer

Nitrogen

Question 21

How many periods does the periodic table have?

Accepted Answer

7

Question 22

which of the values increase by exactly one from element to element when moving across a row?

Accepted Answer

Atomic number

Question 23

How was the early periodic table of elements organized?

Accepted Answer

Mass

Question 24

Electrons in an atom occupy orbitals in energy levels. (true or false)

Accepted Answer

True

Question 25

an element that is shiny and conducts electrical current is likely to be a

Accepted Answer

metal

Question 26

Isotopes of an element have different numbers of (a)

Accepted Answer

neutrons

Question 27

Which of the following plays a role in determines an element’s chemical properties?

Accepted Answer

The number of valence electrons

Question 28

Which of the following is a symbol for an element?

Accepted Answer

Al

Question 29

Which element is more reactive?

Accepted Answer

Oxygen

The Periodic Table

Questions 29

The Periodic Table

Questions 29