8.5ABC Review

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a positive charge.

Which students responses are correct?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

How many valence electrons are in an atom of each element in Group 15 in the periodic table? Enter only a number, no letters or words.

Tags

NGSS.MS-PS1-1

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, nonmetal or metalloid. Which table was completed correctly?

• A

• B

• C

• D

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?

• the two elements are in the same period, with element R the first element in the period and element Q the last element

• the two elements are side by side in the same period, with element Q to the left or element R

• the two elements are in the same group, with element R just above element Q

• the two elements are in the same group, with element Q at the top of the group and element R at the bottom

Tags

NGSS.MS-PS1-1

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

You can identify the number of protons by looking at the ____________ on the periodic table.

• Atomic mass
• Atomic number
• Atomic Symbol
• Impossible

The periodic table is arranged in ______________ that go up and down and are also known as families. 

• groups
• periods
• pods
• elements

An atom of which element is represented by this model?

• Boron (B)
• Carbon (C)
• Neon (Ne)
• Sodium (Na)

Tags

NGSS.MS-PS1-1

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
• The density of calcium , which is 1.54 g/cm^3
• The atomic mass of calcium
• The 2 valence electrons in each calcium atom.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2