Identity and Reactivity

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

Tags

112.20.b.5.B

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

Tags

112.20.b.5.B

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

Tags

112.20.b.5.B

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

Tags

112.20.b.5.B

Match the following

• Valence Electrons

• Reactivity

• Atomic Mass

• Number of Protons + Neutrons

• Atomic Number (protons)

• Element's Identity

Tags

NGSS.MS-PS1-2

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

Tags

112.20.b.5.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

Tags

112.20.b.5.B

In this model, which particle determines the reactivity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

Tags

112.20.b.5.B

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

Tags

112.20.b.5.B

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

Tags

112.20.b.5.B