In the modern periodic table, elements are arranged in order of ___.

• atomic mass

• increasing reactivity

• increasing atomic number

• decreasing atomic number

Why did Mendeleev leave spaces in the table he developed?

• he knew more elements would be discovered

• he did not know what belonged in those spaces

• he wanted the table to look well-designed

• he didn't know the names of all the elements

Based on chemical properties, iodine (I) belongs in the same group as ___.

• Helium and Neon

• Iron and Zinc

• Hydrogen and Lithium

• Bromine and Chlorine

What are 3 broad classes of elements?

• metals, nonmetals, and metalloids

• solids, liquids, and gases

• small, medium, and large

• helium, neon, and argon

The columns on the periodic table are known as ___.

• Groups

• Periods

• Metals

• Nonmetals

The colors in the diagram indicate what?

• metalloids -- elements that act like both metals and nonmetals

• periods -- elements with electrons in the same level

• chemical families -- elements with similar properties

The elements colored yellow are ---

• metals

• nonmetals

• metalloids

• periods

The elements colored blue are ---

• metals

• nonmetals

• metalloids

• groups

Which element is located in group 3, period 2?

• magnesium

• boron

• scandium

• lithium

Which of these elements is a metalloid in period 4?

• carbon

• titanium

• potassium

• arsenic

Tags

NGSS.HS-PS1-1