8th Science 8.5ABC & 6.6A

Valence electrons are the...

• Innermost electrons
• Middle electrons
• Outermost electrons
• Any electrons

What determines the reactivity of an element?

• Size of its nucleus
• Number of total electrons
• Number of valence electrons
• Number of shells

What subatomic particle identify an element ?

• electrons

• protons

• neutrons

• ions

Which students responses are correct?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

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

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown in the image.

Which two atoms are of elements in the same group in the periodic table?

• Atom 1 and Atom 2

• Atom 1 and Atom 4

• Atom 2 and Atom 3

• Atom 3 and Atom 4

Tags

NGSS.MS-PS1-1

Which two elements on the periodic table are in the same period?

• Sn and Rb

• F and Cl

• K and Ba

• Se and Te

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed in the image.

Which of these elements is in this group:

• Lithium

• Strontium

• Aluminum

• Silicon

Which of the following correctly list the three main groups of elements from greatest conductivity to least conductivity? (6.6A)

• Nonmetals-metalloids- metals

• metals-nonmetals-metalloids

• metalloids-metal-nonmetals

• Metals-metalloids-nonmetals

John was observing the physical properties of elements in order to classify them as either a metal, nonmetal, or metalloid. The first element was dull, brittle, and do not conduct heat, what is the element most likely classified as (6.6A)

• metal

• metalloid

• nonmetal