Section 2 A.12- A.13

26. Which are more likely to lose electrons metallic elements or nonmetallic elements?

Metallic

27.Noble gas elements rarely lose or gain electrons. What does this indicate about their chemical reactivity?

They rarely react.

28.Predict whether each of the flowing elements would be morel ikley to form an anion or a cation

a. Na: Cation

b. Ca: Cation

c. F:Anion

d. Cu: Cation

e.O: Anion

f. Li: Cation

g. Sn: Cation

h. I: Anion

29. Which pair is more similar chemically?

a. Copper metal and copper (II) ions

or

v.Oxygen with mass number 16 and oxygen with mass number 18?

-Oxygen with a mass number 16 and oxygen with mass number 18

30. The diameter of a magnesium ion is 156pm the diameter of a strontium ion is 254 pm. Estimate the diameter of a claim ion.

205pm

31. Three kinds of observations that may indicate a chemical change appear in the following list. However, a physical change may also result in each observation. Describe a possible chemical cause and a possible physical cause for each observations

a. A change in color: Coper turns a greenish blue, like the statue of liberty

b. Change in temperature: If the product is heated up

c. Formation of a gas: When the element is oxidized

32 Identify the element that is described by each of the flowing statements:

a. This element is a nonmetal. It forms anions with a -1 charge. It is in the same period as the metals use in a penny.

Bromine  

B.This element is a metalloid. It is in the same period as the elements found in table salt

Silicon

33. Compare your use of the Snake river data to solve the fish-kill mystery in Unit 1 to Mendeleev's use of element data to create the periodic table

So Mendeleev aggregated all the data together, the mass of each element, how many protons and how many neutrons ect. An just put all of it in order.'

34. Mendeleev arranged elements in his periodic table in order of their atomic weights. In the modern periodic table, however, elements are arranged in order of their atomic numbers. Cite two examples from the periodic table for which these two schemes would produce a different ordering of adjacent elements.

 If Mendeleev put the elements in alphabetical order, like by the name or the element.

Another would be if he put them in order of which one was discovered first.