Question

1. according to the octet rule, what will sulfur do to fill its outer shell?

a. lose 6 electrons \t\t\tc. gain 6 electrons
b. lose 2 electrons \t\t\td. gain 2 electrons

1. how many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?

a. 50 protons, 50 electrons, 75 neutrons \t\tc. 120 neutrons, 50 protons, 75 electrons
b. 75 electrons, 50 protons, 50 neutrons \t\td. 70 neutrons, 75 protons, 50 electrons

1. of the elements n, i, ag, and kr which is a metal?

a. n \t\t\t\t\tc. i
b. ag \t\t\t\t\td. kr

1. to what category of elements does an element belong if it has a lack of luster (shine)

a. metals \t\t\t\tc. nonmetals
b. transition metals \t\t\td. metalloids

1. the atomic number of an element whos atoms have 12 protons and 14 neutrons is ______.

a. 2 \t\t\t\t\tc. 12
b. 14 \t\t\t\t\td. 26

1. a unknown element has a high melting point, luster, and loses electrons when it ionizes. which of the following best describes the identity of this element?

a. metalloid \t\t\t\tc. metal
b. non - metal \t\t\t\td. gas

short answer

1. how are the methods henry moseley and dmitri mendeleev used to organize the periodic table different? (4 points)

Explanation:

Question 19

Sulfur has 6 valence electrons. To satisfy the octet rule (8 valence electrons), it is easier for sulfur to gain 2 electrons (to reach 8) than to lose 6. So it will gain 2 electrons.

Step1: Determine protons

Atomic number = number of protons, so protons = 50.

Step2: Determine electrons

In a neutral atom, electrons = protons, so electrons = 50.

Step3: Determine neutrons

Mass number = protons + neutrons, so neutrons = mass number - protons = 125 - 50 = 75.

• N (Nitrogen) is a non - metal.
• I (Iodine) is a non - metal (halogen).
• Ag (Silver) is a metal (transition metal).
• Kr (Krypton) is a noble gas (non - metal). So Ag is the metal.

Answer:

d. Gain 2 electrons

Question 20