STAAR Review Questions

A student is studying the ways different elements are similar to one another. The illustration contains diagrams of atoms from four different elements. 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

Answer explanation

Elements in the same group (column) have the same number of valence electrons!!!

Tags

NGSS.MS-PS1-1

Element R and Element Q have the same number of valence electrons. The 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 of 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.

Answer explanation

Elements with the same number of valence electrons are found in the same group (column) or family!!!!

Tags

NGSS.MS-PS1-1

Students were asked to identify the location of elements in the periodic table based on clues printed on game cards. Based on the data, which periodic table shows the correct location of the four elements?

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• 

Answer explanation

The number of valence electrons identifies the group while the number of energy levels identifies the period.

Tags

NGSS.MS-PS1-1

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

• 5

• 10

• 15

• 20

Answer explanation

The 5 in 15 gives you the number of valence electrons.

Tags

NGSS.MS-PS1-1

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed in the illustration. Which of these elements is in this group?

• Lithium

• Strontium

• Aluminum

• Silicon

Answer explanation

Elements with two valence electrons are found in Group 2 or 2A.

The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card.

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• 
• 

Answer explanation

Metals on the right!!!!!

What sentence best describes how energy flows through this pyramid?

• Energy is transferred down each level of the energy pyramid.

• The energy lost at each level is consumed by organisms in the top level.

• Energy is transferred from organisms in one level to those in the level above.

• The organisms at the bottom level provide energy directly to organisms in all the other levels.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

How many predators in this food web are omnivores?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-LS2-2

How many organisms in this food web eat only producers?

• 3

• 2

• 1

• 4

Tags

NGSS.MS-LS2-2

Which statement accurately describes the atoms of a specific element?

• A nickel, Ni, atom contains 32 electrons outside the nucleus and 64 neutrons inside the nucleus.

• A tellurium, Te, atom contains 52 protons inside the nucleus and 26 electrons outside the nucleus.

• A calcium, Ca, atom contains 20 protons inside the nucleus and 20 electrons outside the nucleus.

• A bromine, Br, atom contains 35 protons outside the nucleus and 35 electrons inside the nucleus.

Tags

NGSS.MS-PS1-1