How many protons does this atom have?

Which sentence best describes the atom in the diagram?

What is the name of this atom?

An atom has an equal number of positively-charged

protons and negatively-charged electrons. If an atom loses or gains electrons, it changes from a neutral atom to an ion. Why is it clear that the model represents a carbon

atom, not a carbon ion?

Which statement describes this oxygen ion?

In addition to ionic bonds, atoms can also form bonds by sharing electrons. These are called covalent bonds, and the covalent compounds that they create have a fixed ratio of atoms. For example, carbon dioxide (CO₂) consists of one carbon atom and two oxygen atoms sharing electrons. In scientific models, these bonds are represented by lines or rods. The names of these compounds contain prefixes that indicate the number of a specific atom. For example, "di" means 2. Based on the passage and the image, what does dioxide mean?

What does each circled plus sign represent?

What does the stick in the ball-and-stick model represent?

Both models show that a hydrogen (H) molecule is formed when

An ionic bond forms when electrons are tranferred from one atom to another. One atom gives up one or more electrons to another atom becomes a positively charged ion. The atom that receives the electron becomes a negatively charged ion. These compounds are called ionic compounds, or salts. Sodium and chlorine form sodium chloride, or table salt, through ionic bonding. Which statement describes the bond in sodium chloride?

Why does the sodium ion have a plus sign?

Alkali metals (Group 1) share a variety of properties. They are soft, pliable, and conduct heat and electricity. They melt at relatively low temperatures and can explode if they become wet.

Which alkali metal melts at the lowest temperature?

What pattern does the information in the table suggest?

Matter cannot be destroyed or created when a chemical reaction occurs. Substances on the left are called the reactants. The newly formed substances on the right are called products. If the number of atoms of each element is the same on both sides of the equation, then the equation is balanced.

Is this equation for water balanced?