Question

which of the following is a correct statement about atoms? a. atoms are ancient and mostly empty space. b. atoms are manufactured in plants. c. atoms grow in humans during pregnancy. d. atoms have electrons, protons and neutrons in their nucleus. question 12 what is the name of the subset of the 6th period in the periodic table? a. actinides b. lanthanides c. transition metals or elements d. chalcogens question 13 who theorized that electrons are in circular orbits with quantized energy levels? a. dalton b. thompson c. rutherford d. bohr

Explanation:

• For Question 11: Atoms are ancient and mostly empty space. Atoms are not manufactured in plants (B is wrong), don't grow in humans during pregnancy (C is wrong), and electrons are outside the nucleus while protons and neutrons are in the nucleus (D is wrong).
• For Question 12: The lanthanides are a subset of the 6th - period elements in the periodic table. Actinides are in the 7th period, transition - metals are in multiple periods, and chalcogens are in group 16 across periods.
• For Question 13: Niels Bohr theorized that electrons are in circular orbits with quantized energy levels. Dalton proposed an early atomic theory, Thompson discovered the electron, and Rutherford proposed the nuclear model of the atom.

Answer:

Question 11: A. Atoms are ancient and mostly empty space.
Question 12: B. Lanthanides
Question 13: D. Bohr