Question

1. name the three subatomic particles

unit 1 exam

1. fill in the following table using the periodic table of elements

element symbol element name protons neutrons electrons
p phosphorus 15 16 15
sb antimony 51 71 51
ne - 23 neon 10 13 10

1. given the following ions, determine the number of protons, electrons, and type of ion

a. cu²+
b. te²-

1. draw the bohr model for argon
2. mary works for a chemistry laboratory and her boss tells her that she needs to find an element with 6 valence electrons and 4 shells. describe how she could find that element on the periodic table and what element is it. (2 - 3 sentences)

Explanation:

Step1: Answer question 1

Protons, neutrons, and electrons are the three sub - atomic particles.

Step2: Answer question 2

The table is already filled correctly. Phosphorus (P) has 15 protons, 16 neutrons, 15 electrons; Antimony (Sb) has 51 protons, 71 neutrons, 51 electrons; Neon - 23 (Ne - 23) has 10 protons, 13 neutrons, 10 electrons.

Step3: Answer question 3a

Copper (Cu) has an atomic number of 29. For $Cu^{2 + }$, the number of protons is 29 (equal to atomic number), the number of electrons is 27 (29 - 2), and it is a cation.

Step3: Answer question 3b

Tellurium (Te) has an atomic number of 52. For $Te^{2 - }$, the number of protons is 52 (equal to atomic number), the number of electrons is 54 (52+2), and it is an anion.

Step4: Answer question 4

Argon (Ar) has an atomic number of 18. In the Bohr model, it has 2 electrons in the first shell, 8 electrons in the second shell, and 8 electrons in the third shell.

Step5: Answer question 5

Elements are arranged in the periodic table by increasing atomic number. The period number indicates the number of electron shells and the group number (for main - group elements) is related to the number of valence electrons. An element with 4 shells is in the 4th period and with 6 valence electrons is in group 16. The element is Selenium (Se).

Answer:

1. Protons, neutrons, electrons
2. Table is already filled correctly as shown

3a. Protons: 29, Electrons: 27, Type of ion: Cation
3b. Protons: 52, Electrons: 54, Type of ion: Anion

1. Bohr model: 2 electrons in first shell, 8 in second shell, 8 in third shell for Ar
2. Look in 4th period and group 16 of the periodic table. The element is Selenium (Se)