What best describes the current atomic theory?
What best describes the current atomic theory?
The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. Each element has its own characteristic atomic number. Atoms of the same element can have different numbers of neutrons, however.
What describes the atomic theory?
Atomic theory is the scientific theory that matter is composed of particles called atoms. According to this idea, if one were to take a lump of matter and cut it into ever smaller pieces, one would eventually reach a point where the pieces could not be further cut into anything smaller.
What is the atomic theory we use today?
The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. What makes atoms of different elements different? The fundamental characteristic that all atoms of the same element share is the number of protons.
Which of the following best describes an atom?
Explanation: An atom consists of three sub atomic particles which are protons, neutrons, and electrons. This nucleus is surrounded by the electrons as electrons revolve around the nucleus. Thus, we can conclude that out of the given options, a core of protons and neutrons surrounded by electrons best describes an atom.
Which best describes where electrons are located in an atom?
Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus.
Which best defines a compound?
a material that is made up of a combination of atoms bonded together best describes a compound.
Does this model represent a compound?
Compounds are represented by chemical formulas. Does this model represent a compound? The model does not represent a compound because it shows two atoms of the same element combined. To be a compound, the model would need to contain atoms of different elements, represented by different-colored balls.
Which statement best describes the model that shows a compound?
Explanation: The definition of a compound, is a chemical substance containing two or more elements chemically bonded together. Model X clearly shows a compound because there are many substances which have two elements chemically bonded to each other.
What are the two major classifications of matter?
Matter can be classified into several categories. Two broad categories are mixtures and pure substances. A pure substance has a constant composition. All specimens of a pure substance have exactly the same makeup and properties.
What is the classification of matter of sugar?
Sugar is a solid substance. When sugar is in its liquid state, it is heated and commonly combined with water, H2O, to help separate the compound more. Simple sugars are called monosaccharides and include glucose (also known as dextrose), fructose and galactose.
What is the difference between elements and compounds?
An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
What are the similarities and differences between elements and compounds?
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.
What are the 5 examples of elements?
Pure Element Examples
- Hydrogen (H) – nonmetal.
- Helium (He) – nonmetal.
- Oxygen (O) – nonmetal.
- Neon (Ne) – nonmetal.
- Nitrogen (N) – nonmetal.
- Carbon (C) – reactive nonmetal.
- Silicon (Si) – metalloid.
- Magnesium (Mg) – alkaline earth metal.
What are the common compounds?
Compounds
| compound name | compound formula | elements present |
|---|---|---|
| carbon dioxide | CO2 | carbon (C) and oxygen (O) |
| sodium chloride | NaCl | sodium (Na) and chlorine (Cl) |
| sodium hydroxide | NaOH | sodium (Na), oxygen (O) and hydrogen (H) |
| calcium chloride | CaCl2 | calcium (Ca) and chlorine (Cl) |
How many compound words are there?
For example, is it book store or bookstore? There are three types of compound words. Closed compounds – flowerpot, keyboard, notebook, bookstore – mesh two words together. Hyphenated compounds – mother-in-law, merry-go-round – not surprisingly use a hyphen between two or more words, often to prevent ambiguity.