Periodic Table and elements

What are elements made of?

• Different types of atoms

• Made of the same type of atom

• Mixtures of various substances

• Compounds of different molecules

Answer explanation

Elements are pure substances made of the same type of atom, distinguishing them from mixtures and compounds, which consist of different types of atoms or molecules.

Tags

NGSS.MS-PS1-1

Which of the following is a metal?

• Oxygen

• Boron

• Copper

• Silicon

Answer explanation

Copper is a metal known for its conductivity and malleability. In contrast, oxygen is a gas, boron and silicon are metalloids, which have properties of both metals and non-metals. Therefore, the correct answer is copper.

What is the periodic table of elements?

• A chart of chemical reactions

• A table that shows a repeating pattern of properties of elements

• A list of all known compounds

• A diagram of atomic structures

Answer explanation

The periodic table of elements is a table that organizes elements based on their properties, showing a repeating pattern. This helps in understanding relationships between different elements, making the correct choice B.

How are elements organized in the periodic table?

• By color

• By alphabetical order

• By periods and groups

• By size

Answer explanation

Elements in the periodic table are organized by periods (rows) and groups (columns), reflecting their atomic structure and properties. This arrangement helps to understand trends and similarities among elements.

What are periods on the periodic table?

• Vertical columns

• Horizontal rows

• Diagonal lines

• Circular patterns

Answer explanation

Periods on the periodic table refer to horizontal rows. Each period represents elements with the same number of electron shells, distinguishing them from groups, which are vertical columns.

What increases as you move across a period on the periodic table?

• Atomic number and mass

• Color intensity

• Temperature

• Volume

Answer explanation

As you move across a period on the periodic table, the atomic number and mass increase due to the addition of protons and neutrons in the nucleus of each successive element.

What are groups on the periodic table?

• Horizontal rows

• Vertical columns

• Diagonal lines

• Circular patterns

Answer explanation

Groups on the periodic table refer to the vertical columns. Elements in the same group share similar chemical properties and have the same number of valence electrons, distinguishing them from horizontal rows, which are called periods.

How many groups are there in the periodic table?

• 7

• 12

• 19

• 25

Answer explanation

The periodic table has 18 main groups, but when including the lanthanides and actinides, it is often considered to have 19 groups. Therefore, the correct answer is 19.

What information is found in each square of the periodic table?

• Atomic number, atomic symbol, element name, atomic mass

• Element color, taste, smell, texture

• Element's uses, history, discovery date, inventor

• Element's price, availability, demand, supply

Answer explanation

Each square of the periodic table contains the atomic number, atomic symbol, element name, and atomic mass, which are essential for identifying and understanding the properties of the elements.

What does the atomic symbol represent?

• The element's color

• The element's first letter('s)

• The element's atomic mass

• The element's price

Answer explanation

The atomic symbol represents the first letter or letters of an element's name, serving as a unique identifier. It does not indicate color, atomic mass, or price.

Tags

NGSS.MS-PS1-1