Chem 101-Spring 2018 Assignment 2: atoms & the periodic table Name Due date: 03/

Question

Chem 101-Spring 2018 Assignment 2: atoms & the periodic table Name Due date: 03/27/2018 @11am calculations to receive.credit (attach asheet. Ifnecessary) Simply writing the answer I ZERO credit!! Record your answer on the scantron provided using a 1B pencil. Ensure that you will earn you bubble in your full name 1. Which of the following is NOT a correct name, symbol combination? E) silicon, Si A) beryllium, Be B) phosphorus, P C) iron, Fe D) manganese, Mg 2. All of the following statements about different elements are true A) Barium is an alkaline earth metal. B) Manganese is a transition metal. C) Sulfur is considered a metalloid. D) Krypton is one of the noble gases. E) lodine is a halogen. Which of the following statements about ions is INCORRECT? A) Cations are positive ions and anions are negative ions. B) Cations are formed when an atom loses clectrons. C) Anions are formed when an atom gains electrons D) Cations always have the same number of protons as electrons E) All statements are correct. 3. 4. How many electrons are in Br ? C) 34 D) 36 E) none of the choices 5. There is very little of the element astatine (symbol At) on earth. If astatine formed an ion, it would most likely have the charge of B) 1- E) none of the choices 6. H ow many neutrons are present in Carbon-14? A) 14 B) 12 7. An atom that has the same number of neutrons as "3Ba is: 8. What is the charge on an ion that has an atomic number of 24 and contains 22e-? 9. What is the identity of element Q if the ion Q contains 10 electrons? 10. Which one of the following is a main-group nonmetal element in period number 3 of the A) 2+ B) 2- A) C B) 0 C) Ne D) Mg periodic table? A) bromine B) selenium C) sodium D) gallium E) sulfur 11. What does "X" represent in the following symbol? 99x A) mercuryB) chlorine C) scandium D) bromine E) selenium

Explanation / Answer

1)

D) Manganese (Mg)

manganese symbol is Mn not Mg

2)

sulfur is a non metal

c) sulfur is a metalloid

3)

Negatively charged ions are called anion

possitively charged ions are called cation

cation is formed by losing one electron

anion is formed by gaining one electron

in nuetral atom cation and anion will be equal but not in cation and anion

so Answer is (d) cation will always have same number of protons and electron

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