2 1 atomic structure and the periodic table

An element is a substance made of atoms that all contain the same number of protons and cannot be split into anything simpler.

True. Nitrogen is an element.

False. Water is a compound composed of hydrogen and oxygen atoms chemically combined.

A compound is a pure substance made up of two or more different elements chemically combined together.

False. Compounds cannot be separated into their elements by physical means.

A mixture is a combination of two or more substances (elements and/or compounds) that are not chemically combined.

A compound consists of two or more elements that are chemically combined, while a mixture consists of two or more substances that are not chemically combined.

True. All substances can be classified into one of these three types.

The classifications of the following are:

An element consists of only one element, while a compound consists of two or more elements that are chemically combined.

Copper wire is an element.

Copper sulfate is not in the Periodic Table because it is a compound / not an element.

A proton has a relative mass of 1 and a charge of +1.

True. All atoms of the same element have the same number of protons.

An electron has a negligible mass and a charge of -1.

The subatomic particles in the nucleus of an atom are protons and neutrons.

To calculate the number of neutrons in an atom:

True. Atoms are made of subatomic particles including protons, neutrons, and electrons.

The subatomic particle with a mass of 1 and a charge of 0 is the neutron.

The number of electrons in an atom is the same as the number of protons / the atomic number.

Atoms are electrioncally neutral because they have the same number of electrons as protons.

False. Electrons have a much smaller mass than protons.

The sub-atomic particle that is not found inside the nucleus is the electron.

The number of protons, neutrons and electrons in an atom of are:

Another term for mass number is nucleon number.

Atomic number tells us the number of protons in the nucleus of an atom.

An electronic configuration is the arrangement of electrons in shells.

True. Electrons occupy the shell closest to the nucleus first.

The first shell can hold a maximum of 2 electrons.

The group gives the number of outer electrons.

True. Chlorine has 3 shells of electrons.

The electronic configuration of sulfur is 2, 8, 6.

The last number in an electronic configuration represents the number of outer electrons.

The second and third shells can each hold a maximum of 8 electrons.

In terms of electrons, other words for shell include:

False. Most elements do not have full outer shells of electrons.

True. Atoms are more stable if they can completely fill their outer shell with electrons.

The electronic configuration of carbon is 2.4.

False. The number of notations in the electronic configuration shows the period that the element is in, indicating the number of occupied shells.

The element with the electronic configuration 2.8.1 is sodium.

Silicon has 3 electron shells and 4 outer electrons .

True. Helium has only one shell of electrons - the first and innermost shell, which holds only 2 electrons.

True. Noble gases have full outer shells of electrons.

Neon's electronic configuration is 2. 8.

Two pieces of information required to calculate the relative atomic mass of an element are:

The equation for calculating relative atomic mass in terms of the percentage abundance and mass of isotopes A and B is:

False. The relative atomic mass of an element is calculated using the mass numbers and relative abundances of all its isotopes.

In terms of isotopes, abundance is the amount of each isotope present in a sample of an element.

The isotopes are and . is not an isotope because it is a different element (nitrogen not carbon).

False. Relative atomic mass is calculated by:

Isotopes have the same symbol and same atomic numbers but different mass numbers.

After calculating the Ar, you would identify an element by looking for the value on the Periodic Table. For example, Ar = 23. On the Periodic Table, the element with an Ar of 23 is sodium.

The relative atomic mass of the element is: = 69.8 or 70

An isotope is an atom of the same element containing the same number of protons but different numbers of neutrons.

The number of protons, neutrons and electrons in are:

False. Isotopes display the same chemical characteristics.

The chemical characteristics of an atom are determined by the number of electrons in the outer shell.