Science

Question 1

What is the atomic number of an element?

Answer 1

The atomic number is the number of protons in the nucleus of an atom.

Question 2

True or False: The rows in the periodic table are called periods.

Answer 2

True

Question 3

Fill in the blank: Elements in the same column of the periodic table are called ______.

Answer 3

groups

Question 4

What does the periodic table arrange elements by?

Answer 4

The periodic table arranges elements by increasing atomic number.

Question 5

Which element has the chemical symbol ‘O’?

Answer 5

Oxygen

Question 6

What are the three main categories of elements in the periodic table?

Answer 6

Metals, Nonmetals, and Metalloids.

Question 7

True or False: Noble gases are highly reactive.

Answer 7

False

Question 8

Fill in the blank: The elements in group 1 are known as ______ metals.

Answer 8

alkali

Question 9

What is the significance of the periodic law?

Answer 9

The periodic law states that the properties of elements are a periodic function of their atomic numbers.

Question 10

Which element is found in group 17 and is a gas at room temperature?

Answer 10

Fluorine

Question 11

What is the main characteristic of metalloids?

Answer 11

Metalloids have properties of both metals and nonmetals.

Question 12

True or False: The atomic mass of an element is the weighted average of all its isotopes.

Answer 12

True

Question 13

What do you call the vertical columns in the periodic table?

Answer 13

Groups or families.

Question 14

What is the most abundant element in the universe?

Answer 14

Hydrogen

Question 15

Fill in the blank: The transition metals are located in groups ______ of the periodic table.

Answer 15

3-12

Question 16

Which element has the highest electronegativity?

Answer 16

Fluorine

Question 17

What is a characteristic property of alkali metals?

Answer 17

They are highly reactive and have one electron in their outer shell.

Question 18

True or False: The lanthanides and actinides are part of the main body of the periodic table.

Answer 18

False

Question 19

What determines the chemical behavior of an element?

Answer 19

The number of electrons in the outermost shell.

Question 20

Which group contains elements that are essential for life?

Answer 20

Group 14 (Carbon group).

Question 21

Fill in the blank: The periodic table was first organized by ______.

Answer 21

Dmitri Mendeleev

Question 22

What is the general trend in atomic size as you move down a group?

Answer 22

Atomic size increases.

Question 23

What are halogens known for?

Answer 23

They are highly reactive nonmetals.

Question 24

True or False: The periodic table includes synthetic elements.

Answer 24

True

Question 25

What is the main purpose of the periodic table?

Answer 25

To organize elements based on their properties and relationships.

Question 26

What do the colors on a periodic table usually represent?

Answer 26

Different categories of elements (metals, nonmetals, metalloids).