Category 1 New Item Types

Select the location of the nucleus

Match the Following

• Positively charged particles found in the nucleus of an atom.

• Atom

• The dense center of an atom containing protons and neutrons.

• Proton

• The smallest unit of an element that keeps the element’s chemical properties.

• Element

• Particles with a neutral charge found in the nucleus of an atom.

• Neutron

• A substance that cannot be broken down into simpler substances by chemical means.

• Nucleus

Magnesium is a ​ (a)   and oxygen is a ​ (b)  

• metal
• non-metal

The center of the atom is called the

The subatomic particle that has no charge is the

A student prepared Bohr model diagrams of atoms of two different elements. The element on the LEFT is ​ (a)   , and the element on the RIGHT is ​ (b)   .

• Beryllium
• Boron
• Oxygen
• Neon
• Fluorine
• Silicon
• Phosphorus

The diagram shows a model of an atom. The model has 4 different symbols on it. Each symbol represents a different role for one of the particles within the atom. In this model, which particle determines the REACTIVITY of this atom?

The ​ (a)   of an element determine the IDENTITY or the name of an element, while the ​ (b)   determine the REACTIVITY of an element.

• protons
• valence electrons
• neutrons
• number of energy levels
• mass number

Sodium is an element with ​ (a)   protons. It also has ​ (b)   valence electron, making the element ​ (c)  

• 11
• 1
• VERY reactive.
• unreactive
• somewhat reactive
• 22
• 23
• 2

(8.5B) An atom of which element is represented by this model?

• Boron (B)
• Carbon (C)
• Neon (Ne)
• Sodium (Na)