Unit 4 Review 24-25

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons are in Beryllium?

Back

4

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; the mass of the reactants equals the mass of the products.

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

If the mass of the reactants is 18g, what is the mass of the products?

Back

18g

Front

What does the atomic number indicate about an element?

Back

The atomic number indicates the number of protons in the nucleus and defines the element.

Front

Which model of a chemical reaction best represents the Law of Conservation of Mass?

Back

Model A.

Front

What is the significance of protons in an atom?

Back

Protons determine the element's identity and its positive charge.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends.