Identify the element shown below. Group of answer choices

Magnesium (Mg)

Hydrogen (H)

You cannot identify the element, there is not enough information.

Helium (He)

Calcium (Ca)

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Question 26.67 pts
A student tests an unknown substance for the following properties and finds the results listed in the table below:

Given this information, which of the following is the most reasonable conclusion for the student to reach?

Group of answer choices

The substance is a metalloid.

The substance is a metal.

The substance is a noble gas.

The substance is a non-metal.

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Question 36.67 pts

Which of the statements accurately compares the elements shown in the table below?

Group of answer choices

Fluorine is the most reactive because it has 7 valence electrons.

Silicon is the most reactive because it is a metalloid.

Gallium is the most reactive because it has the most neutrons.

Boron is the most reactive because Boron has the least amount of protons.

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Question 46.67 pts
Which of the statements below is correct?

Statement Determines identity of an atom Determines reactivity of an atom
1 Electron Cloud Neutron
2 Valence Electrons Protons
3 Protons Valence Electrons
4 Neutrons Electron Cloud
Group of answer choices

2

1

3

4

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Question 56.67 pts
An atom is extremely tiny, and is considered the smallest part of matter. In order to be classified as matter, an atom must have mass. What makes up most of the atom’s mass?
Group of answer choices

The nucleus because it contains protons and neutrons

The nucleus because it contains protons and electrons

The electron cloud because it has the most volume in the atom

The nucleus because it contains all three subatomic particles

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Question 66.67 pts
Below is a partial periodic table showing the location of 6 elements. How many valence electrons will the element marked by #6 have?
**The numbers, 1-6, are marking locations of elements, the numbers do not represent atomic numbers.

Group of answer choices

8

6

4

18

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Question 76.67 pts
Which of the following best describes an electron?
Group of answer choices

It has a positive charge, and much more mass than a neutron.

It has no charge, and about the same mass as a proton.

It has a negative charge, and much less mass than a proton.

It has a negative charge, and about the same mass as a neutron.

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Question 86.67 pts
Which atom model below is the least reactive?

Group of answer choices

A

C

D

B

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Question 96.67 pts
Which statement is correct about the periodic table below? Choose all that are correct.

Group of answer choices

Element 3 is an average conductor of electricity.

Element 3 has 3 more valence electrons than Element 1

Element 2 has the same number of electrons as element 4.

Element 2 has the same number of energy levels as element 4.

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Question 106.67 pts
Valence electrons are
Group of answer choices

the electrons in the outermost occupied shell of an atom. Valence electrons determine reactivity of an atom.

the electrons located in all of the shells added together. Valence electrons determine the mass of an atom.

the electrons located in the shell closest to the nucleus. Valence electrons determine reactivity of an atom.

the electrons located in the outermost occupied shell of an atom. Valence electrons determine the mass of the atom.

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Question 116.67 pts
Which element has 6 energy levels and 7 valence electrons?
Group of answer choices

Seaborgium (Sg)

Rhenium (Re)

Astatine (At)

Polonium (Po)

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Question 126.67 pts
What is the mass number of a Cesium (Cs) atom that has 78 neutrons?
Group of answer choices

132.9

132

133

55

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Question 136.67 pts
A model of Beryllium is shown. What type of particles are found in the cloud surrounding the atom's nucleus?

Group of answer choices

Positively charged particles only

Neutral particles and positively charged particles

Positively and negatively charged particles

Negatively charged particles only

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Question 146.67 pts
Below is a partial periodic table showing the location of 6 elements. Which would be more reactive, an element found in the same group as Element 5, or an element found in the same group as Element 6?
**The numbers, 1-6, are marking locations of elements, the numbers do not represent atomic numbers.

Group of answer choices

Elements in the same group as Element 5

Both groups are non-reactive.

Both groups are very reactive.

Elements in the same group as Element 6

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Question 156.67 pts
A new element has been discovered, and it has been placed at the bottom of Group 1. What physical and chemical properties will this element have?
Group of answer choices

dull, brittle, not reactive

average conductor, shiny , reactive

shiny, malleable, reactive

dull, brittle, reactive