Atom FAQs:

Q: Is an atom the smallest constituent unit of ordinary matter that has the properties of a chemical element?

A: Yes.

Q: Is an atom electrically neutral?

A: Yes.

Q: Is an atom so diffuse that their electric fields could not affect the alpha particles much?

A: Yes.

Q: Are atoms the indivisible?

A: Yes, and ultimate particles of matter.

Q: Is an atom connected or clustered in some manner?

A: Yes.

Q: Are atoms concentrated inside stars and the total mass of atoms forms about 10% of the mass of the galaxy?

A: Yes.

Q: Are atoms found in different states of matter that depend on the physical conditions?

A: Yes, such as temperature and pressure.

Q: Are atoms able to bond into molecules and other types of chemical compounds like ionic and covalent network crystals?

A: Yes.

Q: Is an atom helium with a radius of 32 pm?

A: Yes, while one of the largest is caesium at 225 pm.

Q: Was an atom discarded in favor of one that described atomic orbital zones around the nucleus where a given electron is most likely to be observed?

A: Yes.

Q: Were atoms now explained?

A: Yes, and by Gilbert Newton Lewis in 1916, as the interactions between their constituent electrons.

Q: Is an atom composed of a nucleus and one or more electrons bound to the nucleus?

A: Yes.

Q: Is an atom negative?

A: Yes, and its dependence of its position reaches the minimum inside the nucleus, and vanishes when the distance from the nucleus goes to infinity, roughly in an inverse proportion to the distance.

Q: Is an atom concentrated in a tiny nucleus at the center of the atom?

A: Yes.

Q: Is an atom called the mass number?

A: Yes.

Q: Is an atom visible?

A: Yes.

Q: Are atoms small enough that attempting to predict their behavior using classical physics - as if they were billiard balls?

A: Yes, for example - gives noticeably incorrect predictions due to quantum effects.

Q: Is an atom assumed to orbit the nucleus but could only do so in a finite set of orbits?

A: Yes, and could jump between these orbits only in discrete changes of energy corresponding to absorption or radiation of a photon.

Q: Are atoms far too light to work with directly?

A: Yes, and chemists instead use the unit of moles.

Q: Are atoms joined in a chemical bond?

A: Yes.

Q: Are atoms lined up?

A: Yes, and the material can produce a measurable macroscopic field.

Q: Is an atom the electron, the proton and the neutron?

A: Yes, all three are fermions.

Q: Are atoms electrically neutral if they have an equal number of protons and electrons?

A: Yes.

Q: Are atoms very small?

A: Yes, typical sizes are around 100 pm. However, atoms do not have well-defined boundaries, and there are different ways to define their size that give different but close values.

Q: Is an atom in an external magnetic field, spectral lines become split into three or more components?

A: Yes, a phenomenon called the Zeeman effect.

Q: Is an atom composed of various subatomic particles?

A: Yes.

Q: Are atoms a useful approximation for bonds that form between atoms with one-electron more than a filled shell?

A: Yes, and others that are one-electron short of a full shell, such as occurs in the compound sodium chloride and other chemical ionic salts.

Q: Are atoms passed through a specially shaped magnetic field?

A: Yes, and the beam was split based on the direction of an atom's angular momentum, or spin.

Q: Is an atom attracted to the protons in an atomic nucleus by this electromagnetic force?

A: Yes.

Q: Is an atom lead-208?

A: Yes, and with a mass of 7002207976652100000♠207.

Q: Is an atom called its atomic number?

A: Yes.

Q: Is an atom called an ion?

A: Yes.

Q: Is an atom attracted to the protons in the nucleus by the electromagnetic force?

A: Yes.