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Preguntas del test (22)
1An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
- A85
- B125
- C210
- D295
2An atom has 31 protons and 39 neutrons. What is the atomic number of this element?
- A8
- B31
- C39
- D70
3What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
- A4
- B5
- C9
- D13
4Ernest Rutherford discovered that all the positive particles of the atoms are located in the very dense center of the atom and this area is called what?
- AProton
- BNucleus
- CElectron Cloud
- DNeutron
5Which group lists the parts of an atom from the most massive to the least massive?
- Aproton, nucleus, electron
- Bnucleus, electron, proton
- Celectron, nucleus, proton
- Dnucleus, proton, electron
6The smallest particle into which an element can be divided and still be the same substance is a(n)
- Aelectron
- Bproton
- Catom
- Dmolecule
7An atom has no overall charge because the
- A# electrons = # protons.
- B# neutrons = # protons
- C# neutrons = # electrons.
- Dnucleus is positive and electrons are negative
8What particles make up a nucleus?
- Aelectrons and neutrons
- BNeutrons
- Cprotons and neutrons
- DProtons, neutrons, and electrons
9Electrons are particles that
- AHelp make up the nucleus and are negatively charged.
- BHelp make up the nucleus and are positively charged.
- CAre located outside the nucleus and are negatively charged.
- DAre located outside the nucleus and have no charge.
10Isotopes are atoms of the same element that have different numbers of
- Aprotons
- Bneutrons
- Celectrons
- Dprotons and neutrons
11An atom that gains electrons becomes a(n)
- Anegative ion
- Bpositive ion
- Cmolecule
- Disotope
12Which group(s) of elements are the most reactive non-metals?
- AGroup 18
- BGroup 1
- CGroup 17
- DGroups 3-12
13_____________ is a metalloid and its atoms have six valence electrons.
- ASilicon
- BTellerium
- COxygen
- DChromium
14Which of the following metals is the most reactive?
- Alithium (Li) atomic # 3
- Bcalcium (Ca) atomic # 20
- Ctitanium (Ti) atomic # 22
- Dchlorine(Cl) atomic # 17
15Which element is found in group 4 period 6?
- AHafnium
- BChromium
- CBerrylium
- DLead
16Atoms of most nonmetals have ____ electrons in their outer energy level.
- A1-3
- B4
- C5-8
- D9
17Elements in a group in the periodic table often share similar properties because
- Athey look alike.
- Bthey all have the same number of electrons.
- Cthey have the same physical state.
- Dthey all have the same number of electrons in their outer energy level.
18Which group of metals are the most reactive?
- A1
- B2
- C7
- D8
19How many valenece electrons does magnesium ( atomic number 12) have?
- A12
- B2
- C24
- D3
20Which element has an approximate atomic mass of 80?
- AMercury
- BChlorine
- CBromine
- DOxygen
21Which element is in the same period as sodium (Na) and in the same group as iodine (I)?
- Aphosphorus (P)
- Boxygen (O)
- Cchlorine (Cl)
- Dargon (Ar)
22Potassium atoms readily form bonds with other atoms. Which statement best explains why this happens?
- APotassium atoms have 19 outer electrons and need to lose one to be more stable.
- BPotassium atoms have an equal number of protons and electrons.
- CPotassium atoms have 1 outer electron and need to lose one to be more stable.
- DPotassium atoms are in group 15 and need to gain 3 more to be more stable.
Información
- Descripción
- Test sobre Sin título, creado por Ilona Sit el 28/02/2018.
- Autor
- Ilona Sit
- Idioma
- English
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- 0
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