They must have different numbers of electrons orbiting their nuclei. They must have the same number of neutrons in their nuclei.
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1 37 1 How may utros ar i a uclus of th uclid l? crtai lmt has svral isotops. Which statmt about ths isotops is corrct? Thy must hav diffrt umbrs of lctros orbitig thir ucli. Thy must hav th sam umbr of utros i thir ucli. Thy must hav th sam umbr of uclos i thir ucli. Thy must hav th sam umbr of protos i thir ucli. 3 utral atom cosists of lctros orbitig a uclus. Th uclus cotais protos ad utros. Which statmt about th atom must b corrct? Th umbr of lctros is qual to th umbr of utros. Th umbr of lctros is qual to th umbr of protos. Th umbr of utros is qual to th umbr of protos. Th umbr of lctros, utros ad protos ar all diffrt. 4 low ar th symbols for fiv diffrt uclids uclid 1 uclid 2 uclid 3 uclid 4 uclid 5 Which two uclids ar isotops of th sam lmt? uclid 1 ad uclid 2 uclid 2 ad uclid 3 uclid 2 ad uclid 5 uclid 4 ad uclid 5 PhysicsdMathsTutor.com
2 5 proto ad a utro ar ach clos to a positiv uclus. proto positiv uclus utro How dos th charg o th uclus affct th proto ad th utro, if at all? Th utro is attractd; th proto is rplld. Th utro is ot affctd; th proto is rplld. Th proto is attractd; th utro is rplld. Th proto is ot affctd; th utro is rplld. 6 low ar four statmts about isotops of a crtai lmt. Which statmt about th isotops must b corrct? Thy ar radioactiv. Thy ar ustabl. Thy hav th sam umbr of utros. Thy hav th sam umbr of protos uclus of lmt is rprstd as 26. Which is a isotop of lmt? Th charg o a proto is. What is th charg o a lctro ad what is th charg o a utro? lctro utro 0 0 PhysicsdMathsTutor.com
3 37 9 particular uclid has th symbol l. What is tru for atoms of this uclid? Thr ar uclos i th uclus. Thr ar protos i th uclus. Thr ar 37 lctros i th uclus. Thr ar 37 utros i th uclus is a uclid of carbo. What is th compositio of o uclus of this uclid? utros protos uclid has th symbol N 10. What is th proto umbr of a uclus of this uclid? PhysicsdMathsTutor.com
4 12 Th uclus of a amricium atom cotais 146 utros ad 95 protos. It dcays by mittig a α-particl. How may utros ad how may protos rmai i th uclus wh this form of amricium dcays? 13 Which statmt is corrct for th uclus of ay atom? Th uclus cotais lctros, utros ad protos. Th uclus cotais th sam umbr of protos as utros. Th uclus has a total charg of zro. Th uclus is vry small compard with th siz of th atom. PhysicsdMathsTutor.com
5 14 Which particls ar mittd durig thrmioic missio? atoms lctros utros protos uraium U uclus 92 mits a α-particl. What ar th w uclo ad proto umbrs? Th uclid symbol for radioactiv poloium is Po. uclus of this typ of poloium mits a α-particl. What is th proto umbr (atomic umbr) of th uclus aftr it has mittd th α-particl? Th uclid otatio for radium-226 is Ra. How may lctros orbit th uclus of a utral atom of radium-226? PhysicsdMathsTutor.com
6 18 Radioactiv carbo-14 dcays ito itrog by mittig a β-particl. Th quatio blow rprsts th dcay. 14 P 14 N 7 0 β Q What ar th valus of P ad Q? P Q PhysicsdMathsTutor.com
7 19 radioactiv uclus cotais 128 uclos. It mits a β-particl. How may uclos ar ow i th uclus? Th uclid otatio for radium-226 is Ra. How may lctros orbit th uclus of a utral atom of radium-226? uclid has th symbol. How may protos ar thr i o uclus of this uclid? lithium uclus cotais 3 protos ad 4 utros. What is its uclid otatio? Li 3Li 3Li 4Li 23 particular uclid of chlori ca b rprstd by th symbol show. 37 l How may lctros ar thr i a utral atom of this uclid? PhysicsdMathsTutor.com
8 24 uclid is rprstd by th symbol P. Q How may utros ar i o uclus of th uclid? P Q P Q P Q 25 Which statmt about th ucli of all atoms is corrct? Thy ar vry small compard with th siz of th atoms. Thy always cotai th sam umbr of protos as utros. Thy cotai lctros, utros ad protos. Thy hav a total charg of zro. 26 Th graph shows how th cout rat o a dtctor du to a radioactiv sourc chags with tim. cout rat couts pr miut tim / hours What is th cout rat at 5.0 hours? 960 couts pr miut 600 couts pr miut 150 couts pr miut 0 couts pr miut PhysicsdMathsTutor.com
9 27 Th diagram rprsts a carbo atom. ky utro proto lctro What is th uclo umbr (mass umbr) for this atom? uclid is rprstd by th otatio show. How may uclos ar thr i o atom of this uclid? P Q P Q P Q 29 uclus has protos ad 18 utros. Which otatio is corrct for this uclus? PhysicsdMathsTutor.com
10 30 uclus has protos ad 18 utros. Which otatio is corrct for this uclus? uclus of hlium has th symbol 2H. 3 Which diagram rprsts a atom of 2H? p p p p p ky p = proto = utro = lctro p 32 Which diagram could rprst th structur of a utral atom? ky utro proto lctro PhysicsdMathsTutor.com
11 33 Which statmt about a utral atom of Ra is corrct? It has a qual umbr of utros ad protos. It has mor lctros tha utros. It has mor lctros tha protos. It has mor utros tha protos. 34 radioactiv uclus mits β-particl. a β-particl uclus What happs to th proto umbr (atomic umbr) of th uclus? It stays th sam. It icrass by 1. It dcrass by 2. It dcrass by 4. PhysicsdMathsTutor.com
12 35 atom of th lmt lithium has a uclo umbr of 7 ad a proto umbr of 3. Which diagram rprsts a utral atom of lithium? ky = a utro = a proto = a lctro (ot to scal) PhysicsdMathsTutor.com
13 36 uclid of substac has th symbol How may lctros ar thr i a utral atom of substac? uclus of amricium 95 m mits a α-particl to form a uclus of ptuium (Np). Which quatio rprsts this dcay? 243 m Np α 243 m Np - α 243 m Np α 243 m Np α crtai lmt has svral isotops. Which statmt about ths isotops is corrct? Thy must hav diffrt umbrs of lctros orbitig thir ucli. Thy must hav th sam umbr of utros i thir ucli. Thy must hav th sam umbr of uclos i thir ucli. Thy must hav th sam umbr of protos i thir ucli. PhysicsdMathsTutor.com
14 39 vry importat xprimt icrasd scitists udrstadig of th structur of mattr. I th xprimt, particls scattrd as thy passd through a thi mtal foil. Which particls wr usd, ad to which coclusio did th xprimt lad? particls alpha particls alpha particls bta particls bta particls coclusio mattr is mad up of atoms atoms hav a vry small uclus mattr is mad up of atoms atoms hav a vry small uclus 40 low ar th symbols for fiv diffrt uclids uclid 1 uclid 2 uclid 3 uclid 4 uclid 5 Which two uclids ar isotops of th sam lmt? uclid 1 ad uclid 2 uclid 2 ad uclid 3 uclid 2 ad uclid 5 uclid 4 ad uclid 5 41 low ar four statmts about isotops of a crtai lmt. Which statmt about th isotops must b corrct? Thy ar radioactiv. Thy ar ustabl. Thy hav th sam umbr of utros. Thy hav th sam umbr of protos. PhysicsdMathsTutor.com
15 42 Which diagram rprsts a xprimt that providd vidc for th uclar atom? α-particl β-particl gold uclus gold uclus α-particl β-particl gold uclus gold uclus 43 T h scattrig of α-particls by a thi mtal foil supports th uclar modl of a atom. Why ar α-particls usd rathr tha utros? bcaus thy always travl mor slowly bcaus thy ar havir bcaus thy ar largr i diamtr bcaus thy hav a positiv charg PhysicsdMathsTutor.com
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