PLEASE HELP ILL GIVE U FULL 5 STAR N BRAINLIST ON TOP! answer the ones u know!!. 1. An atom contains 4 protons, 5 neutrons and 4 electrons. its mass number is?
A) 5
B) 9
C) 4
D) 13

2. A charged atom is called:
a) radioactive.
b) a proton.
c) an ion.
d) an isotope.

3. the mass number of an element is the total number of:
a) protons and electrons in an atom.
b) protons in an atom.
c) protons and neutrons in an atom.
d) electrons is an atom.

4. the charge of an atom is always:
a) greater than the charge of it's nucleus.
b) negative.
c) neutral.
d) positive.

5) which of the following is found in the nucleus of an atom?
a) silicon
b) proton
c) electron
d) ion

Mass number of beryllium =4+5=9.

Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions.

The mass number is defined as the total number of protons and neutrons in an atom. The number of neutrons = mass number − atomic number.

An atom, is, by definition, neutral, so the total charge will always be zero. Any charged atom is called an ion. ... A positive charge is carried by protons, and a negative charge is carried by electrons, and in a neutral atom, there are an equal number of protons and electrons.

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

Hope it is helpful

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.