Question

part iii: identification (10 items)
write the correct answer.

1. scientist who proposed law of octaves
2. the \father\ of the periodic table
3. law that grouped elements in threes
4. number of elements in an octave
5. modern basis for periodic table arrangement
6. term for a vertical column in the periodic table
7. term for a horizontal row in the periodic table
8. scientist who left gaps for missing elements
9. element used in a triad with chlorine and iodine
10. similar property among alkaline metals

Explanation:

1. John Newlands proposed the Law of Octaves.
2. Dmitri Mendeleev is considered the "father" of the periodic table.
3. Johann Wolfgang Döbereiner grouped elements in threes with his Law of Triads.
4. In the Law of Octaves, there are 8 elements in an octave.
5. The modern basis for the periodic - table arrangement is atomic number.
6. A vertical column in the periodic table is called a group or family.
7. A horizontal row in the periodic table is called a period.
8. Dmitri Mendeleev left gaps for missing elements in his periodic table.
9. Bromine is an element used in a triad with chlorine and iodine.
10. Alkaline metals are highly reactive, which is a similar property among them.

Answer:

1. John Newlands
2. Dmitri Mendeleev
3. Law of Triads
4. 8
5. Atomic number
6. Group/Family
7. Period
8. Dmitri Mendeleev
9. Bromine
10. High reactivity