Chemistry test #2 review

Front

What is the atomic number of an element?

Back

The number of protons in an atom's nucleus

Answer explanation

The atomic number of an element is defined as the number of protons in its nucleus. This number uniquely identifies the element and determines its position in the periodic table.

Front

If an element has an atomic number of 11, how many protons does it have?

Back

11

Answer explanation

The atomic number of an element indicates the number of protons in its nucleus. Therefore, an element with an atomic number of 11 has 11 protons, making the correct answer 11.

Front

What is the atomic number of this atom? Options: 2, 4, 6, none of the above

Back

2

Answer explanation

The atomic number of an atom is defined as the number of protons in its nucleus. The atom with atomic number 2 is helium, which has 2 protons. Therefore, the correct answer is 2.

Tags

NGSS.MS-PS1-1

Front

What is the atomic number of this atom?

Back

3

Answer explanation

The atomic number of an atom is determined by the number of protons in its nucleus. The correct answer is 3, which corresponds to lithium, as it has 3 protons.

Tags

NGSS.MS-PS1-1

Front

Which of the following is a metal? Oxygen, Boron, Copper, Silicon

Back

Copper

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.

Front

What are periods on the periodic table?

Back

Horizontal rows

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.

Front

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

Back

Atomic number and mass

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.

Front

What are groups on the periodic table?

Back

Vertical columns

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.

Front

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

Back

Atomic number, atomic symbol, element name, atomic mass

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.

Front

How many neutrons are in a Gold atom? Options: 79, 196, 118, 275

Back

118

Tags

NGSS.MS-PS1-1