Question

1. in the blank, label the elements or properties as metal(m), nonmetal (nm) or metalloid (met). argon arsenic chromium neon nitrogen silicon calcium potassium sodium cobalt radon antimony tend to lose valence electrons to obey octet rule tend to gain valence electrons to obey octet rule lustrous dull brittle good conductor high melting points 2. fill in the blank: mosely arranged the modern periodic table by increasing arranged the first periodic table by increasing 3. what elements would have similar properties to fluorine (f)? a. oxygen and nitrogen b. iodine and bromine c. neon and oxygen d. sulfur and phosphorous 4. refer to the periodic table below and answer the questions that follow. which letters represent alkali metals? which letters represent good conductors? which letters represent halogens? which letters represent elements with 1 valence electron? which letters represent an element with similar properties as letter a? which letters represent alkaline earth metals? which letters represent transition metals?

Explanation:

Step1: Recall element - type properties

Metals are good conductors, have high melting points, and are lustrous. Non - metals are dull, brittle, and poor conductors. Metalloids have intermediate properties.

Step2: Analyze each element in question 1

• Argon (Ar) is a noble gas, a non - metal (NM).
• Potassium (K) is an alkali metal, a metal (M).
• Arsenic (As) is a metalloid (met).
• Chromium (Cr) is a transition metal, a metal (M).
• Neon (Ne) is a noble gas, a non - metal (NM).
• Sodium (Na) is an alkali metal, a metal (M).
• Cobalt (Co) is a transition metal, a metal (M).
• Radon (Rn) is a noble gas, a non - metal (NM).
• Nitrogen (N) is a non - metal (NM).
• Silicon (Si) is a metalloid (met).
• Calcium (Ca) is an alkaline earth metal, a metal (M).
• Antimony (Sb) is a metalloid (met).

Step3: Recall periodic table trends for question 2

Mendeleev arranged the first periodic table by increasing atomic mass. Modern periodic tables are arranged by increasing atomic number.

Step4: Recall group properties for question 3

Elements in the same group have similar properties. Fluorine (F) is a halogen. Iodine (I) and bromine (Br) are also halogens and have similar properties to fluorine.

Step5: Identify element groups for question 4

• Alkali metals: Sodium (Na) is an alkali metal. In the table, if we assume the general layout of the periodic table, an element with 1 valence electron like sodium could be represented by a letter corresponding to an alkali - metal group element.
• Good conductors: Metals are good conductors. Transition metals like Chromium (Cr) and Cobalt (Co) are good conductors.
• Halogens: Fluorine (F) is a halogen. In the table, a halogen - group element letter would be relevant.
• Elements with similar properties as a given element: Elements in the same group have similar properties.
• Alkaline earth metals: Calcium (Ca) is an alkaline earth metal.
• Transition metals: Chromium (Cr) and Cobalt (Co) are transition metals.

Answer:

1. Argon: NM, Potassium: M, Arsenic: met, Chromium: M, Neon: NM, Sodium: M, Cobalt: M, Radon: NM, Nitrogen: NM, Silicon: met, Calcium: M, Antimony: met
2. atomic number
3. b. iodine and bromine
4. Without seeing the full context of the periodic - table lettering, we can't give specific letter answers. But in general, for alkali metals (elements with 1 valence electron), look for elements in Group 1; for good conductors (metals), look at transition metals and main - group metals; for halogens, look at Group 17; for elements with similar properties as a given element, look in the same group; for alkaline earth metals, look at Group 2; for transition metals, look at the d - block elements.