Question

Classify each of the following elements as a metal, nonmetal, or metalloid.
Na, Ge, Si, Br, Ag

Metal
Nonmetal
Metalloid



Multiple Choice

Which statement is not part of Dalton's atomic theory?

All atoms of a given element have the same mass and other properties.
Certain groups of elements have similar properties.
Each element is composed of indestructible particles called atoms.
Atoms combine in simple whole-number ratios to form compounds.



Which of the following statements is true about the properties of protons, neutrons, and electrons?
One positive charge cancels (neutralizes) another positive charge.
One negative charge cancels (neutralizes) another negative charge.
Positive and negative charges attract.
Protons have much less mass than neutrons and electrons.

Answer 1

ig i i i i i i i i i ii i i i i i ii i i i i i

Answer 2

1. Na is metal

Ge is Metalloid

Si is  Metalloid

Br is Nonmetal

Ag is Metal

2. Each element is composed of indestructible particles called atoms.

3. Positive and negative charges attract.

What is Chemistry?

Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.

In the scope of its subject, chemistry occupies an intermediate position between physics and biology.  It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).

Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.

Learn more about Chemistry

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