Question

16 an atom will form a _?__ bond with another atom. see # 10(this means the question is similar to # 10, in other words, its about bonding)
17 know chemical and physical changes.
18 know the properties of:
a solid c gas
b liquid d plasma(not needed)
19 know the atomic theories of these scientists... sketch each of their models.
a democritus c bohr
b rutherford d dalton
20 the group 1 elements are known as _?____ metals
21 know metals, nonmetals and metalloids physical and chemical properties.
22 what is the most electronegative element? what is the trend moving down the group?
23 the outer electron configuration of a group 4a(14) (or others) element is _?_
24 bonds involve_?____ ionic they are being ________, covalent they are being __________?
25 positive or negative ions are formed by the _?_
26 the type of bonding in h₂____or kcl __________or others is _?_
a ionic c polar covalent
b metallic d nonpolar covalent
27 see # 26
28 the correct formula for iron (ii) sulfide is_?_
29 the formula for carbon dioxide is _?_
30 what type of covalent bond is present in water? covalent(polar) its two non - metals.
31 the type of bonding in nacl,__________ mgo,________ co__________.
32 if an element from group1a or 2a or 6a bonds with an element from group 7a, the bonding will b _?_
33 the correct name for k₂s is _?_______________
34 what is an intensive property? give two examples.
35 see # 34 except extensive properties.
36 a measure of the quantity or volume of matter is ____________________
37 see # 17
38 see # 17

Explanation:

To answer these questions, we'll go through each one by one, using concepts from Chemistry (a subfield of Natural Science). Here are the solutions for some of the key questions:

Question 20: The group 1 elements are known as ? metals

Group 1 elements in the periodic table (e.g., Li, Na, K) are called alkali metals. This is a fundamental classification in chemistry.

Step 1: Identify the most electronegative element

Fluorine (F) is the most electronegative element. Electronegativity is a measure of an atom’s ability to attract electrons in a bond.

Step 2: Trend down a group

Electronegativity decreases as you move down a group (column) in the periodic table. This is because atomic size increases, so the nucleus has less pull on outer electrons.

Step 1: Bonding in $\ce{H2}$

$\ce{H2}$ has a nonpolar covalent bond (option D).

Step 2: Bonding in $\ce{KCl}$

$\ce{KCl}$ has an ionic bond (option A).

Answer:

alkali

Question 22: What is the most electronegative element? What is the trend moving down the group?