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WorksheetsElement's Identity & Reactivity
Total questions: 22
Worksheet time: 12mins
Match the following
Element's Identity
Atomic Number (protons)
Reactivity
Valence Electrons
Number of Protons + Neutrons
Atomic Mass
Sodium and lithium have similar chemical properties. What characteristic of these elements explains why they are chemically similar?
Their atoms both have one valence electron
Their atoms both have more neutrons than protons
Their atoms have the same number of energy levels
Their atoms contain equal numbers of protons and electrons
Atoms of which two elements are represented by these models?
Oxygen, O, and neon, Ne
Fluorine, F, and neon, Ne
Silicon, Si, and phosphorous, P
Beryllium, Be, and boron, B
Which pair of elements has reactivity that is similar to chlorine, Cl?
Fluorine, F, and argon, Ar
Fluorine, F, and iodine, I
Sulfur, S, and bromine, Br
Sulfur, S, and argon, Ar
Atoms of which element has a combined total of 11 protons?
Sodium, Na
Boron, B
Copper, Cu
None of these
In this model, which particle determines the reactivity of this atom?
Particle W
Particle X
Particle Y
Particle Z
Based on these drawings, which element is the LEAST reactive?
Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
Boron is the most reactive because it has the most protons
Fluorine is the most reactive because it has 7 electrons in the outer shell
Silicon is the most reactive because it has an equal number of protons and neutrons
Gallium is the most reactive because it has many more neutrons than protons
Four students were asked to name the parts of an atom that determine that atom's identity and chemical properties. The students' responses are shown in the table. Which student's responses are correct?
Student 1
Student 2
Student 3
Student 4
Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?
Tin atoms have 50 protons
Tin atoms have 5 valence electrons
Tin atoms have 119 neutrons
Tin atoms have 68 electrons
The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
The element is sodium, and it is highly reactive
The element is fluorine, and it is not very reactive
The element is sodium, and it is not very reactive
The element is fluorine, and it is highly reactive
A chemist is identifying the elements present in a sample of seawater.
What characteristic of an element's atoms always determines the element's identity?
The number of protons
The number of neutrons
The location of valence electrons
The number of valence electrons
A student is studying calcium, a highly reactive element that humans need for strong bones.
Which characteristic of calcium is most closely related to its chemical reactivity?
The 20 protons in each atom of calcium
The density of calcium, which is 1.54 g/cm3
The atomic mass of calcium, which is 40.078 amu
The 2 valence electrons in each atom of calcium
The table lists three characteristics of an atom of an element.
An atom of which element is described by the data in the table?
Radon (Rn)
Cadmium (Cd)
Rubidium (Rb)
Astatine (At)
An atom of which element is represented by this model?
Boron (B)
Carbon (C)
Neon (Ne)
Sodium (Na)
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically.
Which property of the unknown element determines the other elements it reacts with?
The total number of neutrons in the unknown element
The total number of particles in the nucleus of the unknown element
The number of protons in the nucleus of the unknown element
The number of valence electrons in the unknown element
How many protons does Iron, Fe, have inside its nucleus?
13
26
55
56
How many protons does an atom of Antimony, Sb, have inside its nucleus?
26
51
121
122
How many total energy levels does an atom of Sodium, Na, have in its electron cloud?
11
1
3
23
How many total energy levels does Krypton, Kr, have in its electron cloud?
4
84
36
8
How many valence electrons does an atom of Sulfur, S, have?
16
7
32
3
How many valence electrons does an atom of Calcium, Ca, have?
20
4
40
2
