2) what is the name of a group of atoms that have the same atomic number but different atomic mass?
3) fluorine’s atomic number is 9 and its atomic mass is 19. how many neutrons does fluorine have?
4). an uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. how many protons does boron have?
5). how can you determine the approximate mass of an atom, in atomic mass units?
6). atoms with the same number of protons but with different electrical charges are
7). in salt, what is the nature of the bond between sodium and chloride?
8). an ionic bond involves
9). the innermost electron shell of an atom can hold up to how many electrons? (the shell closest to the nucleus)
10). what determines the types of chemical reactions or bonds that an atom participates in?

2) Isotopes

3) 10.

4) 5.

5) protons + neutrons

6) ions.

7) Ionic bond.

8) Gain and loss of electrons.

9) 2.  

10) Electronegativity.

Explanation:

2) Isotopes, it means that atoms are of the same element, because they have the same number of protons (atomic number). But there will be some heavier than the other because they have different amounts of neutrons. The mass is = protons + neutrons.

3) 10. The Fluor has 10 neutrons because the mass is equal to protons (atomic number) + neutrons. Then 19 (mass) = 9 (atomic number - protons) + 10 (neutrons)

4) 5. Boron has 5 protons because the atomic number is equal to the number of protons.

5)The appproximate mass of an atom is the number of protons plus neutrons. It is in the nucleus of the atom.

6) ions. When an atom is neutral its protons and electrons are in the same amount (they are canceled to zero). Whereas when the atoms have different charges, it means that they have more or less electrons than protons, that is, the negative charges are not canceled but give another value. If there are more protons than electrons, the atom's charge will be positive and that ion is called a cation. If there are more electrons than protons, the atom's charge will be negative and that ion is called anion.

7) Ionic bond. Chlorine has an electronegativity of 3.16 and sodium one of 0.93. It means that chlorine has a greater ability to attract electrons. As the subtraction of these two values is> 1.7. It means that the link between the two is ionic.

8) Gain and loss of electrons. Unlike covalent bonds, electrons do not share electrons in an ionic bond, but there is an element that earns them (is negatively charged = anion) and an element that yields them (is negatively charged = cation)

9) 2. According to the electronic configuration. In the first energy level, the sublevel "s" can only have 2 electrons.

10) Electronegativity. What determines the type of bonds is electronegativity, that is, the ability to attract electrons that have a certain atom. Generally, metals have less electronegativity, so they can give their electrons easier. With nonmetals the opposite occurs. And if there are two elements with electronegativity differences <1.7 they will share electrons.

2. Isotopes

3. 10

4. 5

5. By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.

6. Ions

7. Ionic

8. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions

9. 2 electrons

10. The number of electrons in the outermost electron shell

Explanation:

Isotopes are atoms that have the same atomic number but different atomic mass

To find number of neutrons, subtract the atomic number from the mass number. Hence, 19 - 9 = 10

The number of protons in an uncharged atom is equal to the atomic number

Atoms with the same number of protons but different electrical charges are different ions. They can't be different isotopes because different isotopes of an atom have different numbers of protons

The bond between sodium and chlorine is ionic

2, the next shell holds 2n, the one after that holds 3n

The number of electrons in the outermost electron shell determines the reaction

that's what i got you can count the number of atoms