Question

1. this element has an atomic number lower than that of aluminum (al) and one less valence electron than the group 6 (16) elements.
2. which elements has their outermost electrons in the 4th energy level?
3. which family has their outermost energy level “full” of electrons?
4. which family has 2 valence electrons?
5. the number of the square on the periodic table is the
6. which family contains elements with only one valence electron?
7. what are the 3 subatomic particles, their charge and location in the atom?

1.
2.
3.
charge:
charge:
charge:
location:
location:
location:

1. describe the atomic model:

a. rutherford:
dalton:
bohr:
thomson:

1. elements that share similar properties are most likely apart of the same:

Explanation:

1. Aluminum has atomic number 13. Group 6 (16) elements have 6 valence - electrons, so the element with 5 valence - electrons and atomic number less than 13 is nitrogen (N) with atomic number 7.
2. Elements in the fourth period have their outermost electrons in the 4th energy level, like potassium (K), calcium (Ca), etc.
3. Noble gases have their outermost energy level full of electrons.
4. Alkaline earth metals have 2 valence electrons.
5. The number of the square on the periodic table is the atomic number.
6. Alkali metals contain elements with only one valence electron.
7. Proton: positive charge, in the nucleus; neutron: no charge, in the nucleus; electron: negative charge, in the electron - cloud outside the nucleus.
8. Rutherford: proposed a nuclear model with a small, dense, positively - charged nucleus and electrons orbiting around it. Dalton: considered atoms as indivisible, solid spheres. Bohr: proposed that electrons move in fixed orbits around the nucleus. Thomson: proposed the plum - pudding model where electrons are embedded in a positively - charged sphere.
9. Elements that share similar properties are most likely part of the same group.

Answer:

1. Nitrogen (N)
2. Elements in the fourth period (e.g., K, Ca)
3. Noble gases
4. Alkaline earth metals
5. Atomic number
6. Alkali metals
7. 1. Proton; positive; nucleus. 2. Neutron; no charge; nucleus. 3. Electron; negative; electron - cloud outside the nucleus.
8. Rutherford: Nuclear model with electrons orbiting nucleus. Dalton: Indivisible solid - sphere atoms. Bohr: Electrons in fixed orbits. Thomson: Plum - pudding model.
9. Group