13-25
13. Give noter term for each of these features of the periodic table
Rows: Periods
Column: Group or family
14. Give the names and symbols of two elements other than lithium in the alkai metal family
Sodium: Na
Potassium:K
15. Consider the noble gas family:
a. Where are noble gases located on the periodic table? On the right side of the table
b. Name one physical property that noble gases share. they are all gases
c.Name one chemical property that noble gases share. Unreactive or chemically inert.
16. Given a periodic table and the formulas BeCl2 and AIN, predict the formula for a compound containing
A. Mg2F
b GaP
17.The melting points of sodium(Na) and rubidium are 98 degrees C and 39 degrees C, respectively. Estimate the melting point of potassium
63.65 °C
18. Would you expect the boiling p oint of chlorine to be higher or lower than that of iodine?
Chlorine would have a higher boiling point because Iodine is right next to the nobel gases and those have the lowest boiling points
19.
Look at graph
20. Illistrat the number of protons, neutrons and electronic an atom of
a. beryllium b. nitrogen c. neon
21. A student is asked to explain the formation of a lead (II) ion from an electrically neutral lead atom. The student says that a lead atom must have gained two protons to make the ion. How would you correct this student's mistaken explanation?
You have to loose 2 ELECTRONS not protons.
22.Calculate the mass number for each element in the table
Carbon: 6
Calcium: 21
platinum: 117
Uranium: 146
B. Carbon is an isotope
23. A scientist announces the discovery of a new element. The only characteristic given in the report is the element's mass number of 266. Is this information sufficient, by itself, to justify the claim of the discovery of a new element?
No because we need to know more than just how much an element weighs
24. The mass of an electron is way lighter than a mass of a proton or a neutron
25.
12 proton 12 electrons
12 proton 12 electrons
12 proton 12 electrons
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